Subrect snapshot support.

content/browser/android/content_view_core_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/android/content_view_core_impl.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
@@ skipping 534 matching lines @@
   Java_ContentViewCore_showPastePopup(env, obj.obj(), static_cast<jint>(x),
                                       static_cast<jint>(y));
 }
 
 unsigned int ContentViewCoreImpl::GetScaledContentTexture(
     const gfx::Size& size) {
   RenderWidgetHostViewAndroid* view = GetRenderWidgetHostViewAndroid();
   if (!view)
     return 0;
 
-  return view->GetScaledContentTexture(size);
+  return GetScaledContentTexture(size, GetBounds());

[no sievers, 2012/12/17 21:20:02]

Using GetBounds() here is racy during resizing, because this returns the size of
the view while the texture might have a different size.
I guess you have the same problem with passing in a source rect below, so it
would be better to always scale the whole thing and later copy out your subrect.
What's this used for?

+}
+
+unsigned int ContentViewCoreImpl::GetScaledContentTexture(
+      const gfx::Size& size,
+      const gfx::Rect& src_rect) {
+  RenderWidgetHostViewAndroid* view = GetRenderWidgetHostViewAndroid();
+  if (!view)
+    return 0;
+
+  return view->GetScaledContentTexture(size, src_rect);
 }
 
 void ContentViewCoreImpl::StartContentIntent(const GURL& content_url) {
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jobject> j_obj = java_ref_.get(env);
   if (j_obj.is_null())
     return;
   ScopedJavaLocalRef<jstring> jcontent_url =
       ConvertUTF8ToJavaString(env, content_url.spec());
   Java_ContentViewCore_startContentIntent(env,
@@ skipping 716 matching lines @@
   if (!HasField(env, clazz, "mNativeContentViewCore", "I")) {
     DLOG(ERROR) << "Unable to find ContentView.mNativeContentViewCore!";
     return false;
   }
   g_native_content_view = GetFieldID(env, clazz, "mNativeContentViewCore", "I");
 
   return RegisterNativesImpl(env) >= 0;
 }
 
 }  // namespace content