android: add ThumbnailCache

content/browser/android/content_view_core_impl.cc

Index: content/browser/android/content_view_core_impl.cc
diff --git a/content/browser/android/content_view_core_impl.cc b/content/browser/android/content_view_core_impl.cc
index 62ddeea7fc0277ecfffc97db342bd397d265e2cd..ddc684d7e019e3897dfd410de0b3e634dde2b76f 100644
--- a/content/browser/android/content_view_core_impl.cc
+++ b/content/browser/android/content_view_core_impl.cc
@@ -630,7 +630,7 @@ void ContentViewCoreImpl::ShowPastePopup(int x_dip, int y_dip) {
 
 void ContentViewCoreImpl::GetScaledContentBitmap(
     float scale,
-    jobject jbitmap_config,
+    SkBitmap::Config bitmap_config,
     gfx::Rect src_subrect,
     const base::Callback<void(bool, const SkBitmap&)>& result_callback) {
   RenderWidgetHostViewAndroid* view = GetRenderWidgetHostViewAndroid();
@@ -638,8 +638,7 @@ void ContentViewCoreImpl::GetScaledContentBitmap(
     result_callback.Run(false, SkBitmap());
     return;
   }
-  SkBitmap::Config skbitmap_format = gfx::ConvertToSkiaConfig(jbitmap_config);
-  view->GetScaledContentBitmap(scale, skbitmap_format, src_subrect,
+  view->GetScaledContentBitmap(scale, bitmap_config, src_subrect,
       result_callback);
 }