android: add ThumbnailCache

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 cf620c0136e1ad40c3ff2ce8b2320be15e2fddd0..dafe120d436e5e5fc498f27e84070382efe2f279 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"
 #include "ui/gfx/rect.h"
 
 class SkBitmap;
@@ -55,7 +56,7 @@ class CONTENT_EXPORT ContentViewCore {
   // success or not. The content is passed through the SkBitmap parameter.
   virtual void GetScaledContentBitmap(
       float scale,
-      jobject bitmap_config,
+      SkBitmap::Config config,
       gfx::Rect src_rect,
       const base::Callback<void(bool, const SkBitmap&)>& result_callback) = 0;
   virtual float GetDpiScale() const = 0;