[devtools] Support different encodings for Page.CaptureScreenshot.

content/browser/renderer_host/render_widget_host_impl.h

Index: content/browser/renderer_host/render_widget_host_impl.h
diff --git a/content/browser/renderer_host/render_widget_host_impl.h b/content/browser/renderer_host/render_widget_host_impl.h
index 8c17eef9be6970a9fd9b47198fb2d10594983947..ed5fe6b696e27be8e0fe99783294fe52d3ebc2d7 100644
--- a/content/browser/renderer_host/render_widget_host_impl.h
+++ b/content/browser/renderer_host/render_widget_host_impl.h
@@ -49,14 +49,11 @@
 #include "ui/events/latency_info.h"
 #include "ui/gfx/native_widget_types.h"
 
+class SkBitmap;
 struct FrameHostMsg_HittestData_Params;
 struct ViewHostMsg_SelectionBounds_Params;
 struct ViewHostMsg_UpdateRect_Params;
 
-namespace base {
-class RefCountedBytes;
-}
-
 namespace blink {
 class WebInputEvent;
 class WebMouseEvent;
@@ -209,9 +206,9 @@ class CONTENT_EXPORT RenderWidgetHostImpl : public RenderWidgetHost,
   void NotifyScreenInfoChanged();
 
   // Forces redraw in the renderer and when the update reaches the browser
-  // grabs snapshot from the compositor. Returns PNG-encoded snapshot.
-  using GetSnapshotFromBrowserCallback =
-      base::Callback<void(const unsigned char*, size_t)>;
+  // grabs snapshot from the compositor. Returns an SkBitmap containing the
+  // snapshot or an empty SkBitmap if taking the snapshot failed.
+  using GetSnapshotFromBrowserCallback = base::Callback<void(const SkBitmap&)>;
   void GetSnapshotFromBrowser(const GetSnapshotFromBrowserCallback& callback);
 
   const NativeWebKeyboardEvent* GetLastKeyboardEvent() const;
@@ -700,13 +697,10 @@ class CONTENT_EXPORT RenderWidgetHostImpl : public RenderWidgetHost,
 
   void WindowSnapshotReachedScreen(int snapshot_id);
 
-  void OnSnapshotDataReceived(int snapshot_id,
-                              const unsigned char* png,
-                              size_t size);
-
-  void OnSnapshotDataReceivedAsync(
-      int snapshot_id,
-      scoped_refptr<base::RefCountedBytes> png_data);
+  void OnSnapshotReceived(int snapshot_id,
+                          int retry_count,
+                          const SkBitmap& bitmap,
+                          ReadbackResponse response);
 
   // 1. Grants permissions to URL (if any)
   // 2. Grants permissions to filenames