cast: support cursor rendering for tab capture

content/browser/media/capture/cursor_renderer_dummy.cc

+// Copyright (c) 2015 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 "content/browser/media/capture/cursor_renderer_dummy.h"
+
+namespace content {
+
+// TODO(isheriff): When we do have a MAC implementation, rename dummy

[miu, 2015/10/23 01:55:12]

Oh.  If this is why you wrote this class, you should name it
CursorRendererCocoa, and use a .mm extension (instead of .cc) so that the ObjC++
compiler will be used.  Then, in each method, you can add a NOTIMPLEMENTED();
statement.

However, it would also be fine it you didn't include this class in this CL, and
just introduce it later.  Your call.

[Irfan, 2015/10/26 23:10:31]

Done.

+// appropriately
+CursorRendererDummy::CursorRendererDummy(gfx::NativeView window) :
+    weak_factory_(this) {
+}
+
+CursorRendererDummy::~CursorRendererDummy() {
+}
+
+void CursorRendererDummy::Clear() {
+}
+
+bool CursorRendererDummy::Update(const gfx::Rect& region_in_frame) {
+  return false;
+}
+
+void CursorRendererDummy::RenderOnVideoFrame(
+    const scoped_refptr<media::VideoFrame>& target) const {
+}
+
+base::WeakPtr<CursorRenderer> CursorRendererDummy::GetWeakPtr() {
+  return weak_factory_.GetWeakPtr();
+}
+
+}  // namespace content