SF: add buffer checks to Render Engine

Make sure that both input and output buffers are GPU accessible
before Render Engine tries to do something with the buffers.

Test: Boot, launch an app, take a screenshot
Bug: 158790260
Change-Id: I905a670f6cc2d419b49fe79694df6e71d60a2a92
diff --git a/libs/renderengine/gl/GLESRenderEngine.cpp b/libs/renderengine/gl/GLESRenderEngine.cpp
index 397f038..2b09c15 100644
--- a/libs/renderengine/gl/GLESRenderEngine.cpp
+++ b/libs/renderengine/gl/GLESRenderEngine.cpp
@@ -1125,6 +1125,8 @@
         return BAD_VALUE;
     }
 
+    validateOutputBufferUsage(buffer);
+
     std::unique_ptr<BindNativeBufferAsFramebuffer> fbo;
     // Gathering layers that requested blur, we'll need them to decide when to render to an
     // offscreen buffer, and when to render to the native buffer.
@@ -1249,6 +1251,7 @@
             isOpaque = layer->source.buffer.isOpaque;
 
             sp<GraphicBuffer> gBuf = layer->source.buffer.buffer;
+            validateInputBufferUsage(gBuf);
             bindExternalTextureBuffer(layer->source.buffer.textureName, gBuf,
                                       layer->source.buffer.fence);