android: Migrate old content readback to use async readback (and delegated renderer)

content/public/browser/android/content_view_core.h

Index: content/public/browser/android/content_view_core.h
diff --git a/content/public/browser/android/content_view_core.h b/content/public/browser/android/content_view_core.h
index 85766ee504c6ef347320cd6a4e5957b4280f78ea..038d909f6d4f9f72ddefa66ec1472357ed33a0e3 100644
--- a/content/public/browser/android/content_view_core.h
+++ b/content/public/browser/android/content_view_core.h
@@ -11,6 +11,7 @@
 #include "base/callback.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/navigation_controller.h"
+#include "third_party/skia/include/core/SkBitmap.h"
 
 namespace cc {
 class Layer;
@@ -48,9 +49,10 @@ class CONTENT_EXPORT ContentViewCore {
   virtual void LoadUrl(NavigationController::LoadURLParams& params) = 0;
   virtual jint GetCurrentRenderProcessId(JNIEnv* env, jobject obj) = 0;
   virtual void ShowPastePopup(int x, int y) = 0;
-  virtual unsigned int GetScaledContentTexture(
+  virtual void GetScaledContentBitmap(
       float scale,
-      gfx::Size* out_size) = 0;
+      gfx::Size* out_size,
+      const base::Callback<void(bool, const SkBitmap&)>& callback) = 0;
   virtual float GetDpiScale() const = 0;
   virtual void RequestContentClipping(const gfx::Rect& clipping,
                                       const gfx::Size& content_size) = 0;