Timeline: add support for deferred canvas rasterization

Source/core/platform/PlatformInstrumentation.h

Index: Source/core/platform/PlatformInstrumentation.h
diff --git a/Source/core/platform/PlatformInstrumentation.h b/Source/core/platform/PlatformInstrumentation.h
index 5c449930b19e3eee165fbd14b65430828f46b923..2afbeac427f3995b6f8cfaddbf21d56e54d8aafe 100644
--- a/Source/core/platform/PlatformInstrumentation.h
+++ b/Source/core/platform/PlatformInstrumentation.h
@@ -46,6 +46,8 @@ public:
     virtual void didDecodeImage() = 0;
     virtual void willResizeImage(bool shouldCache) = 0;
     virtual void didResizeImage() = 0;
+    virtual void willRasterizeCanvas() = 0;
+    virtual void didRasterizeCanvas() = 0;
 };
 
 class PlatformInstrumentation {
@@ -63,6 +65,8 @@ public:
     static void didDecodeImage();
     static void willResizeImage(bool shouldCache);
     static void didResizeImage();
+    static void willRasterizeCanvas();
+    static void didRasterizeCanvas();
 
 private:
     static const char CategoryName[];
@@ -100,6 +104,18 @@ inline void PlatformInstrumentation::didResizeImage()
     m_client->didResizeImage();
 }
 
+inline void PlatformInstrumentation::willRasterizeCanvas()
+{
+    FAST_RETURN_IF_NO_CLIENT_OR_NOT_MAIN_THREAD();
+    m_client->willRasterizeCanvas();
+}
+
+inline void PlatformInstrumentation::didRasterizeCanvas()
+{
+    FAST_RETURN_IF_NO_CLIENT_OR_NOT_MAIN_THREAD();
+    m_client->didRasterizeCanvas();
+}
+
 } // namespace WebCore
 
 #endif // PlatformInstrumentation_h