Add PlatformPictureSkia and RecordingPlatformDeviceSkia.

skia/ext/platform_canvas.h

Index: skia/ext/platform_canvas.h
diff --git a/skia/ext/platform_canvas.h b/skia/ext/platform_canvas.h
index cbeb95b2bbe252cf5c5ebc7bd3abeeb3ad29dcf8..db10ac66b00aca27272371c09ab1eea0817462e8 100644
--- a/skia/ext/platform_canvas.h
+++ b/skia/ext/platform_canvas.h
@@ -120,6 +120,15 @@ SK_API SkCanvas* TryCreateBitmapCanvas(int width, int height, bool is_opaque);
 // return NULL PlatformSurface.
 SK_API bool SupportsPlatformPaint(const SkCanvas* canvas);
 
+// Returns true if native platform routines can be used to draw on the

[alokp, 2012/09/20 15:47:51]

I am still not quite clear on the differences between direct and indirect paint.
What exactly is indirect?

[reveman, 2012/09/20 17:01:26]

In the current implementation this means use of a temporary bitmap and the need
to playback previous commands to this bitmap. I was being a bit vague here as it
could potentially mean something else. The important part is, indirect is not as
efficient as direct.

I'll improve the comment. I guess there's no need to be this vague here.

+// given canvas without any indirect rendering taking place. Indirect
+// rendering can be expensive so it's recommended to avoid using
+// platform paint if possible when direct platform paint isn't supported.
+// E.g. if there's a method to perform text rendering without platform
+// paint then it's likely much more efficient to use that method in the
+// case when this function returns false.
+SK_API bool SupportsDirectPlatformPaint(const SkCanvas* canvas);
+
 // Draws into the a native platform surface, |context|.  Forwards to
 // DrawToNativeContext on a PlatformDevice instance bound to the top device.
 // If no PlatformDevice instance is bound, is a no-operation.