Create HintSessionWrapper right after CanvasContext

Move the construction of the HintSessionWrapper to RT right after the
creation of the CanvasContext to ensure enough time is provided to
not block the critical path in most cases.

Bug: 266560774
Test: manual
Change-Id: I1a67b163acd9c41156d9b9e14e974c67b6ba6ed5
diff --git a/libs/hwui/renderthread/RenderProxy.cpp b/libs/hwui/renderthread/RenderProxy.cpp
index 5edb0b1..353078d 100644
--- a/libs/hwui/renderthread/RenderProxy.cpp
+++ b/libs/hwui/renderthread/RenderProxy.cpp
@@ -45,8 +45,12 @@
     pid_t uiThreadId = pthread_gettid_np(pthread_self());
     pid_t renderThreadId = getRenderThreadTid();
     mContext = mRenderThread.queue().runSync([=, this]() -> CanvasContext* {
-        return CanvasContext::create(mRenderThread, translucent, rootRenderNode, contextFactory,
-                                     uiThreadId, renderThreadId);
+        CanvasContext* context = CanvasContext::create(mRenderThread, translucent, rootRenderNode,
+                                                       contextFactory, uiThreadId, renderThreadId);
+        if (context != nullptr) {
+            mRenderThread.queue().post([=] { context->startHintSession(); });
+        }
+        return context;
     });
     mDrawFrameTask.setContext(&mRenderThread, mContext, rootRenderNode);
 }