Enable texture readback support for Android

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 021624d67be87d550060d992ba0c1a0ca94d376a..86425f0967f61410f37cbe4c53a0d05135c6db12 100644
--- a/content/public/browser/android/compositor.h
+++ b/content/public/browser/android/compositor.h
@@ -70,6 +70,10 @@ class Compositor {
   // Deletes an OpenGL texture.
   virtual void DeleteTexture(WebKit::WebGLId texture_id) = 0;
 
+  // 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.
+  virtual void CopyTextureToBitmap(WebKit::WebGLId texture_id,
+                                   gfx::JavaBitmap& bitmap) = 0;

[no sievers, 2012/10/20 00:42:36]

Do you really need to add this generic interface?
Isn't the one in ContentViewCore enough?

[David Trainor- moved to gerrit, 2012/10/22 08:31:07]

For ContentViewCore#getBitmap it is, but for some of the other delayed capture
work the RWHV might be destroyed, in which case I need a way to grab the bitmap
from a texture.  ContentViewCore has a method to copy and scale the RWHV's
texture to a new one, which I can readback here even if the original one is
gone.

On 2012/10/20 00:42:36, Daniel Sievers wrote:

  protected:
   Compositor() {}
 };