[SP] Allocate an SkPictureRecorder only once per GraphicsContext instantiation

Source/platform/graphics/GraphicsContext.h

Index: Source/platform/graphics/GraphicsContext.h
diff --git a/Source/platform/graphics/GraphicsContext.h b/Source/platform/graphics/GraphicsContext.h
index 697aa1be3348fdaa8df5668028eaa66e2d446eb9..c24fca55512a206232aa32082de42cd939fad9a3 100644
--- a/Source/platform/graphics/GraphicsContext.h
+++ b/Source/platform/graphics/GraphicsContext.h
@@ -49,6 +49,7 @@ class SkImage;
 class SkPaint;
 class SkPath;
 class SkPicture;
+class SkPictureRecorder;
 class SkRRect;
 class SkTextBlob;
 struct SkImageInfo;
@@ -440,7 +441,9 @@ private:
 
     AnnotationModeFlags m_annotationMode;
 
+    // Only used when Slimming Paint is off. When it is on, m_pictureRecorder is used instead.
     Vector<OwnPtr<RecordingState>> m_recordingStateStack;
+    OwnPtr<SkPictureRecorder> m_pictureRecorder;

[f(malita), 2015/04/13 21:39:45]

This has the same lifetime as GC - can we drop the OwnPtr wrapper and just store
a straight SkPictureRecorder instead?

[chrishtr, 2015/04/13 21:48:34]

Done.

 
 #if ENABLE(ASSERT)
     unsigned m_layerCount;