Subrect snapshot support.

android_webview/native/aw_contents.cc

Index: android_webview/native/aw_contents.cc
diff --git a/android_webview/native/aw_contents.cc b/android_webview/native/aw_contents.cc
index 74edfa16aa34060e5479d75779876cc9ee1b1e15..7ade0d6881fb476d09c66f60656a3fd774587a4a 100644
--- a/android_webview/native/aw_contents.cc
+++ b/android_webview/native/aw_contents.cc
@@ -120,8 +120,15 @@ class NullCompositor : public content::Compositor {
     return 0;
   }
   virtual void DeleteTexture(WebKit::WebGLId texture_id) OVERRIDE {}
-  virtual void CopyTextureToBitmap(WebKit::WebGLId texture_id,
-                                   gfx::JavaBitmap& bitmap) OVERRIDE {}
+  virtual bool CopyTextureToBitmap(WebKit::WebGLId texture_id,
+                                   gfx::JavaBitmap& bitmap) OVERRIDE {
+    return false;
+  }
+  virtual bool CopyTextureToBitmap(WebKit::WebGLId texture_id,
+                                   const gfx::Rect& src_rect,
+                                   gfx::JavaBitmap& bitmap) OVERRIDE {
+    return false;
+  }
   virtual void SetHasTransparentBackground(bool flag) OVERRIDE {}
 };