[devtools] Support different encodings for Page.CaptureScreenshot.

ui/snapshot/snapshot_ios.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/snapshot/snapshot.h"
 
 #include "base/callback.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/image/image.h"
 
 namespace ui {
 
 bool GrabViewSnapshot(gfx::NativeView view,
                       std::vector<unsigned char>* png_representation,
-                      const gfx::Rect& snapshot_bounds) {
+                      const gfx::Rect& snapshot_bounds,
+                      SnapshotEncoding encoding,
+                      SnapshotQuality quality) {
   // TODO(bajones): Implement iOS snapshot functionality
   return false;
 }
 
 bool GrabWindowSnapshot(gfx::NativeWindow window,
                         std::vector<unsigned char>* png_representation,
-                        const gfx::Rect& snapshot_bounds) {
+                        const gfx::Rect& snapshot_bounds,
+                        SnapshotEncoding encoding,
+                        SnapshotQuality quality) {
   // TODO(bajones): Implement iOS snapshot functionality
   return false;
 }
 
 void GrabWindowSnapshotAndScaleAsync(
     gfx::NativeWindow window,
     const gfx::Rect& snapshot_bounds,
     const gfx::Size& target_size,
     scoped_refptr<base::TaskRunner> background_task_runner,
     GrabWindowSnapshotAsyncCallback callback) {
   callback.Run(gfx::Image());
 }
 
 void GrabViewSnapshotAsync(
     gfx::NativeView view,
     const gfx::Rect& source_rect,
     scoped_refptr<base::TaskRunner> background_task_runner,
-    const GrabWindowSnapshotAsyncPNGCallback& callback) {
+    const GrabWindowSnapshotAsyncEncodedCallback& callback,
+    SnapshotEncoding encoding,
+    SnapshotQuality quality) {
   callback.Run(scoped_refptr<base::RefCountedBytes>());
 }
 
 void GrabWindowSnapshotAsync(
     gfx::NativeWindow window,
     const gfx::Rect& source_rect,
     scoped_refptr<base::TaskRunner> background_task_runner,
-    const GrabWindowSnapshotAsyncPNGCallback& callback) {
+    const GrabWindowSnapshotAsyncEncodedCallback& callback,
+    SnapshotEncoding encoding,
+    SnapshotQuality quality) {
   callback.Run(scoped_refptr<base::RefCountedBytes>());
 }
 
 }  // namespace ui