[Chromoting] Initial plumbing for cursor shape.

remoting/host/capturer_mac.cc

Index: remoting/host/capturer_mac.cc
diff --git a/remoting/host/capturer_mac.cc b/remoting/host/capturer_mac.cc
index 6c016225c34b390b80c407d25095a96c9f2de6c9..1232baabfec9dcb2504c5cef142a787b61b3de1d 100644
--- a/remoting/host/capturer_mac.cc
+++ b/remoting/host/capturer_mac.cc
@@ -158,7 +158,7 @@ class CapturerMac : public Capturer {
   bool Init();
 
   // Capturer interface.
-  virtual void Start() OVERRIDE;
+  virtual void Start(const CursorShapeChangedCallback& callback) OVERRIDE;
   virtual void Stop() OVERRIDE;
   virtual void ScreenConfigurationChanged() OVERRIDE;
   virtual media::VideoFrame::Format pixel_format() const OVERRIDE;
@@ -306,7 +306,10 @@ void CapturerMac::ReleaseBuffers() {
   }
 }
 
-void CapturerMac::Start() {
+void CapturerMac::Start(
+    const CursorShapeChangedCallback& callback) {
+  cursor_shape_changed_callback_ = callback;
+
   // Create power management assertions to wake the display and prevent it from
   // going to sleep on user idle.
   IOPMAssertionCreate(kIOPMAssertionTypeNoDisplaySleep,
@@ -328,6 +331,11 @@ void CapturerMac::Stop() {
   }
 }
 
+void CapturerMac::SetCursorShapeChangedCallback(
+    const CursorShapeChangedCallback& callback) {
+  // TODO(garykac) Implement cursor shape for Mac. (crbug.com/116299)
+}
+
 void CapturerMac::ScreenConfigurationChanged() {
   ReleaseBuffers();
   helper_.ClearInvalidRegion();