[devtools] Support different encodings for Page.CaptureScreenshot.

ui/snapshot/snapshot_ios.mm

Index: ui/snapshot/snapshot_ios.mm
diff --git a/ui/snapshot/snapshot_ios.mm b/ui/snapshot/snapshot_ios.mm
index d75f204fe8dc18897cbd96c0db4820341db2d645..928c582f3227feafa0a8871cdd641aa896ba16e6 100644
--- a/ui/snapshot/snapshot_ios.mm
+++ b/ui/snapshot/snapshot_ios.mm
@@ -11,14 +11,14 @@
 namespace ui {
 
 bool GrabViewSnapshot(gfx::NativeView view,
-                      std::vector<unsigned char>* png_representation,
+                      gfx::Image* image,
                       const gfx::Rect& snapshot_bounds) {
   // TODO(bajones): Implement iOS snapshot functionality
   return false;
 }
 
 bool GrabWindowSnapshot(gfx::NativeWindow window,
-                        std::vector<unsigned char>* png_representation,
+                        gfx::Image* image,
                         const gfx::Rect& snapshot_bounds) {
   // TODO(bajones): Implement iOS snapshot functionality
   return false;
@@ -33,20 +33,16 @@ void GrabWindowSnapshotAndScaleAsync(
   callback.Run(gfx::Image());
 }
 
-void GrabViewSnapshotAsync(
-    gfx::NativeView view,
-    const gfx::Rect& source_rect,
-    scoped_refptr<base::TaskRunner> background_task_runner,
-    const GrabWindowSnapshotAsyncPNGCallback& callback) {
-  callback.Run(scoped_refptr<base::RefCountedBytes>());
+void GrabViewSnapshotAsync(gfx::NativeView view,
+                           const gfx::Rect& source_rect,
+                           const GrabWindowSnapshotAsyncCallback& callback) {
+  callback.Run(gfx::Image());
 }
 
-void GrabWindowSnapshotAsync(
-    gfx::NativeWindow window,
-    const gfx::Rect& source_rect,
-    scoped_refptr<base::TaskRunner> background_task_runner,
-    const GrabWindowSnapshotAsyncPNGCallback& callback) {
-  callback.Run(scoped_refptr<base::RefCountedBytes>());
+void GrabWindowSnapshotAsync(gfx::NativeWindow window,
+                             const gfx::Rect& source_rect,
+                             const GrabWindowSnapshotAsyncCallback& callback) {
+  callback.Run(gfx::Image());
 }
 
 }  // namespace ui