Subrect snapshot support.

content/public/browser/android/compositor.h

Index: content/public/browser/android/compositor.h
diff --git a/content/public/browser/android/compositor.h b/content/public/browser/android/compositor.h
index bca7fe797a3cfb558eececb3152e814bdfa5d1e2..b090531f3e3944cc1e3d557fd4c1ffdc055ae245 100644
--- a/content/public/browser/android/compositor.h
+++ b/content/public/browser/android/compositor.h
@@ -95,6 +95,7 @@ class CONTENT_EXPORT Compositor {
   // Grabs a copy of |texture_id| and saves it into |bitmap|.  No scaling is
   // done.  It is assumed that the texture size matches that of the bitmap.

[no sievers, 2012/12/17 23:48:59]

update the comment -> "src_rect needs to match the size of the bitmap."
Maybe even return an error if it does not.

[David Trainor- moved to gerrit, 2012/12/18 19:14:31]

Done.

   virtual void CopyTextureToBitmap(WebKit::WebGLId texture_id,
+                                   const gfx::Rect& src_rect,
                                    gfx::JavaBitmap& bitmap) = 0;
  protected:
   Compositor() {}