diff --git a/libs/renderengine/skia/Cache.cpp b/libs/renderengine/skia/Cache.cpp
new file mode 100644
index 0000000..4fdae74
--- /dev/null
+++ b/libs/renderengine/skia/Cache.cpp
@@ -0,0 +1,146 @@
+/*
+ * Copyright 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Cache.h"
+#include "AutoBackendTexture.h"
+#include "SkiaRenderEngine.h"
+#include "android-base/unique_fd.h"
+#include "renderengine/DisplaySettings.h"
+#include "renderengine/LayerSettings.h"
+#include "ui/GraphicBuffer.h"
+#include "ui/GraphicTypes.h"
+#include "ui/PixelFormat.h"
+#include "ui/Rect.h"
+#include "utils/Timers.h"
+
+namespace android::renderengine::skia {
+
+static void drawShadowLayer(SkiaRenderEngine* renderengine, const DisplaySettings& display,
+                            sp<GraphicBuffer> dstBuffer) {
+    // Somewhat arbitrary dimensions, but on screen and slightly shorter, based
+    // on actual use.
+    FloatRect rect(0, 0, display.physicalDisplay.width(), display.physicalDisplay.height() - 30);
+    LayerSettings layer{
+            .geometry =
+                    Geometry{
+                            .boundaries = rect,
+                            .roundedCornersCrop = rect,
+                    },
+            .shadow =
+                    ShadowSettings{
+                            .ambientColor = vec4(0, 0, 0, 0.00935997f),
+                            .spotColor = vec4(0, 0, 0, 0.0455841f),
+                            .lightPos = vec3(370.508f, -1527.03f, 1650.f),
+                            .lightRadius = 2200.0f,
+                            .length = 0.955342f,
+                    },
+    };
+
+    auto layers = std::vector<const LayerSettings*>{&layer};
+    // The identity matrix will generate the fast shaders, and the second matrix
+    // (based on one seen while going from dialer to the home screen) will
+    // generate the slower (more general case) version. If we also need a
+    // slow version without color correction, we should use this matrix with
+    // display.outputDataspace set to SRGB.
+    for (const mat4 transform : { mat4(), mat4(0.728872f,   0.f,          0.f, 0.f,
+                                               0.f,         0.727627f,    0.f, 0.f,
+                                               0.f,         0.f,          1.f, 0.f,
+                                               167.355743f, 1852.257812f, 0.f, 1.f) }) {
+        layer.geometry.positionTransform = transform;
+        renderengine->drawLayers(display, layers, dstBuffer, false /* useFrameBufferCache*/,
+                                 base::unique_fd(), nullptr);
+    }
+}
+
+static void drawImageLayers(SkiaRenderEngine* renderengine, const DisplaySettings& display,
+                            sp<GraphicBuffer> dstBuffer, sp<GraphicBuffer> srcBuffer) {
+    const Rect& displayRect = display.physicalDisplay;
+    FloatRect rect(0, 0, displayRect.width(), displayRect.height());
+    LayerSettings layer{
+            .geometry =
+                    Geometry{
+                            .boundaries = rect,
+                            // This matrix is based on actual data seen when opening the dialer.
+                            // What seems to be important in matching the actual use cases are:
+                            // - it is not identity
+                            // - the layer will be drawn (not clipped out etc)
+                            .positionTransform = mat4(.19f,     .0f, .0f,   .0f,
+                                                      .0f,     .19f, .0f,   .0f,
+                                                      .0f,      .0f, 1.f,   .0f,
+                                                      169.f, 1527.f, .0f,   1.f),
+                            .roundedCornersCrop = rect,
+                    },
+            .source = PixelSource{.buffer =
+                                          Buffer{
+                                                  .buffer = srcBuffer,
+                                                  .maxMasteringLuminance = 1000.f,
+                                                  .maxContentLuminance = 1000.f,
+                                          }},
+    };
+
+    // Test both drawRect and drawRRect
+    auto layers = std::vector<const LayerSettings*>{&layer};
+    for (float roundedCornersRadius : {0.0f, 500.f}) {
+        layer.geometry.roundedCornersRadius = roundedCornersRadius;
+        // No need to check UNKNOWN, which is treated as SRGB.
+        for (auto dataspace : {ui::Dataspace::SRGB, ui::Dataspace::DISPLAY_P3}) {
+            layer.sourceDataspace = dataspace;
+            for (bool isOpaque : {true, false}) {
+                layer.source.buffer.isOpaque = isOpaque;
+                for (auto alpha : {half(.23999f), half(1.0f)}) {
+                    layer.alpha = alpha;
+                    renderengine->drawLayers(display, layers, dstBuffer,
+                                             false /* useFrameBufferCache*/, base::unique_fd(),
+                                             nullptr);
+                }
+            }
+        }
+    }
+}
+
+void Cache::primeShaderCache(SkiaRenderEngine* renderengine) {
+    const nsecs_t timeBefore = systemTime();
+    // The dimensions should not matter, so long as we draw inside them.
+    const Rect displayRect(0, 0, 1080, 2340);
+    DisplaySettings display{
+            .physicalDisplay = displayRect,
+            .clip = displayRect,
+            .maxLuminance = 500,
+            .outputDataspace = ui::Dataspace::DISPLAY_P3,
+    };
+
+    const int64_t usage = GRALLOC_USAGE_HW_RENDER | GRALLOC_USAGE_HW_TEXTURE;
+
+    sp<GraphicBuffer> dstBuffer =
+            new GraphicBuffer(displayRect.width(), displayRect.height(), PIXEL_FORMAT_RGBA_8888, 1,
+                              usage, "primeShaderCache_dst");
+    // This buffer will be the source for the call to drawImageLayers. Draw
+    // something to it as a placeholder for what an app draws. We should draw
+    // something, but the details are not important. We only need one version of
+    // the shadow's SkSL, so draw it here, giving us both a placeholder image
+    // and a chance to compile the shadow's SkSL.
+    sp<GraphicBuffer> srcBuffer =
+            new GraphicBuffer(displayRect.width(), displayRect.height(), PIXEL_FORMAT_RGBA_8888, 1,
+                              usage, "drawImageLayer_src");
+    drawShadowLayer(renderengine, display, srcBuffer);
+
+    drawImageLayers(renderengine, display, dstBuffer, srcBuffer);
+    const nsecs_t timeAfter = systemTime();
+    const float compileTimeMs = static_cast<float>(timeAfter - timeBefore) / 1.0E6;
+    ALOGD("shader cache generated in %f ms\n", compileTimeMs);
+}
+
+} // namespace android::renderengine::skia
diff --git a/libs/renderengine/skia/Cache.h b/libs/renderengine/skia/Cache.h
new file mode 100644
index 0000000..437571e
--- /dev/null
+++ b/libs/renderengine/skia/Cache.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+namespace android::renderengine::skia {
+
+class SkiaRenderEngine;
+
+class Cache {
+public:
+    static void primeShaderCache(SkiaRenderEngine*);
+
+private:
+    Cache() = default;
+};
+
+} // namespace android::renderengine::skia
diff --git a/libs/renderengine/skia/SkiaGLRenderEngine.cpp b/libs/renderengine/skia/SkiaGLRenderEngine.cpp
index cbb02a3..f504a9a 100644
--- a/libs/renderengine/skia/SkiaGLRenderEngine.cpp
+++ b/libs/renderengine/skia/SkiaGLRenderEngine.cpp
@@ -40,6 +40,7 @@
 #include <ui/DebugUtils.h>
 #include <ui/GraphicBuffer.h>
 #include <utils/Trace.h>
+#include "Cache.h"
 
 #include <cmath>
 #include <cstdint>
@@ -224,6 +225,10 @@
     return engine;
 }
 
+void SkiaGLRenderEngine::primeCache() {
+    Cache::primeShaderCache(this);
+}
+
 EGLConfig SkiaGLRenderEngine::chooseEglConfig(EGLDisplay display, int format, bool logConfig) {
     status_t err;
     EGLConfig config;
diff --git a/libs/renderengine/skia/SkiaGLRenderEngine.h b/libs/renderengine/skia/SkiaGLRenderEngine.h
index 1c3a633..15d834d 100644
--- a/libs/renderengine/skia/SkiaGLRenderEngine.h
+++ b/libs/renderengine/skia/SkiaGLRenderEngine.h
@@ -50,6 +50,7 @@
                        EGLSurface protectedPlaceholder);
     ~SkiaGLRenderEngine() override EXCLUDES(mRenderingMutex);
 
+    void primeCache() override;
     void cacheExternalTextureBuffer(const sp<GraphicBuffer>& buffer) override;
     void unbindExternalTextureBuffer(uint64_t bufferId) override;
     status_t drawLayers(const DisplaySettings& display,
diff --git a/libs/renderengine/skia/SkiaRenderEngine.h b/libs/renderengine/skia/SkiaRenderEngine.h
index 79a1040..f403725 100644
--- a/libs/renderengine/skia/SkiaRenderEngine.h
+++ b/libs/renderengine/skia/SkiaRenderEngine.h
@@ -39,7 +39,7 @@
     SkiaRenderEngine(RenderEngineType type) : RenderEngine(type) {}
     ~SkiaRenderEngine() override {}
 
-    virtual void primeCache() const override{};
+    virtual void primeCache() override{};
     virtual void genTextures(size_t /*count*/, uint32_t* /*names*/) override{};
     virtual void deleteTextures(size_t /*count*/, uint32_t const* /*names*/) override{};
     virtual void cacheExternalTextureBuffer(const sp<GraphicBuffer>& /*buffer*/){};
@@ -64,4 +64,4 @@
 } // namespace renderengine
 } // namespace android
 
-#endif /* SF_GLESRENDERENGINE_H_ */
\ No newline at end of file
+#endif /* SF_GLESRENDERENGINE_H_ */