Added support of relative mouse motion in Chromoting.

remoting/client/plugin/pepper_input_handler.h

Index: remoting/client/plugin/pepper_input_handler.h
diff --git a/remoting/client/plugin/pepper_input_handler.h b/remoting/client/plugin/pepper_input_handler.h
index 0e63e0f10e90471edd0bc016d08f82bd2e36c9ec..c72243e5a0e8f924413a279533c2f56be4ff53a3 100644
--- a/remoting/client/plugin/pepper_input_handler.h
+++ b/remoting/client/plugin/pepper_input_handler.h
@@ -6,10 +6,16 @@
 #define REMOTING_CLIENT_PLUGIN_PEPPER_INPUT_HANDLER_H_
 
 #include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "ppapi/cpp/mouse_lock.h"
+#include "ppapi/cpp/point.h"
+#include "ppapi/utility/completion_callback_factory.h"
 #include "remoting/protocol/input_stub.h"
 
 namespace pp {
+class ImageData;
 class InputEvent;
+class Instance;
 }  // namespace pp
 
 namespace remoting {
@@ -18,16 +24,70 @@ namespace protocol {
 class InputStub;
 } // namespace protocol
 
-class PepperInputHandler {
+class PepperInputHandler : public pp::MouseLock {
  public:
-  explicit PepperInputHandler(protocol::InputStub* input_stub);
+  // |instance| must outlive |this|.
+  PepperInputHandler(pp::Instance* instance, protocol::InputStub* input_stub);
   virtual ~PepperInputHandler();
 
   bool HandleInputEvent(const pp::InputEvent& event);
 
+  // Enables locking the mouse when the host sets a completely transparent mouse
+  // cursor.
+  void AllowMouseLock();
+
+  // Called when the plugin receives or loses focus.
+  void DidChangeFocus(bool has_focus);
+
+  // Sets the mouse cursor image. Passing NULL image will lock the mouse if
+  // mouse lock is enabled.
+  void SetMouseCursor(scoped_ptr<pp::ImageData> image,
+                      const pp::Point& hotspot);
+
  private:
+  enum MouseLockState {
+    MouseLockDisallowed,
+    MouseLockOff,
+    MouseLockRequestPending,
+    MouseLockOn,
+    MouseLockCancelling
+  };
+
+  // pp::MouseLock interface.
+  virtual void MouseLockLost() OVERRIDE;
+
+  // Requests the browser to lock the mouse and hides the cursor.
+  void RequestMouseLock();
+
+  // Requests the browser to cancel mouse lock and restores the cursor once
+  // the lock is gone.
+  void CancelMouseLock();
+
+  // Applies |cursor_image_| as the custom pointer or uses the standard arrow
+  // pointer if |cursor_image_| is not available.
+  void UpdateMouseCursor();
+
+  // Handles completion of the mouse lock request issued by RequestMouseLock().
+  void OnMouseLocked(int error);
+
+  pp::Instance* instance_;
   protocol::InputStub* input_stub_;
 
+  pp::CompletionCallbackFactory<PepperInputHandler> callback_factory_;
+
+  // Custom cursor image sent by the host. |cursor_image_| is set to NULL when
+  // the cursor image is completely transparent. This can be interpreted as
+  // a mouse lock request if enabled by the webapp.
+  scoped_ptr<pp::ImageData> cursor_image_;
+
+  // Hot spot for |cursor_image_|.
+  pp::Point cursor_hotspot_;
+
+  // True if the plugin has focus.
+  bool has_focus_;
+
+  MouseLockState mouse_lock_state_;
+
   // Accumulated sub-pixel and sub-tick deltas from wheel events.
   float wheel_delta_x_;
   float wheel_delta_y_;