Support mouse lock in Flash fullscreen mode.

content/renderer/render_view_mouse_lock_dispatcher.cc

+// 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 "content/renderer/render_view_mouse_lock_dispatcher.h"
+
+#include "content/common/view_messages.h"
+#include "content/renderer/render_view_impl.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebWidget.h"
+
+RenderViewMouseLockDispatcher::RenderViewMouseLockDispatcher(
+    RenderViewImpl* render_view_impl)
+    : content::RenderViewObserver(render_view_impl),
+      render_view_impl_(render_view_impl) {
+}
+
+RenderViewMouseLockDispatcher::~RenderViewMouseLockDispatcher() {
+}
+
+void RenderViewMouseLockDispatcher::SendLockMouseRequest(
+    bool unlocked_by_target) {
+  bool user_gesture =
+      render_view_impl_->webview() &&
+      render_view_impl_->webview()->mainFrame() &&
+      render_view_impl_->webview()->mainFrame()->isProcessingUserGesture();
+
+  Send(new ViewHostMsg_LockMouse(routing_id(), user_gesture, unlocked_by_target,
+                                 false));
+}
+
+void RenderViewMouseLockDispatcher::SendUnlockMouseRequest() {
+  Send(new ViewHostMsg_UnlockMouse(routing_id()));
+}
+
+bool RenderViewMouseLockDispatcher::OnMessageReceived(
+    const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(RenderViewMouseLockDispatcher, message)
+    IPC_MESSAGE_HANDLER(ViewMsg_LockMouse_ACK, OnMsgLockMouseACK)
+    IPC_MESSAGE_FORWARD(ViewMsg_MouseLockLost,
+                        static_cast<MouseLockDispatcher*>(this),
+                        MouseLockDispatcher::OnMouseLockLost)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void RenderViewMouseLockDispatcher::OnMsgLockMouseACK(bool succeeded) {
+  // Notify the base class.
+  OnLockMouseACK(succeeded);
+
+  // Mouse Lock removes the system cursor and provides all mouse motion as
+  // .movementX/Y values on events all sent to a fixed target. This requires
+  // content to specifically request the mode to be entered.
+  // Mouse Capture is implicitly given for the duration of a drag event, and
+  // sends all mouse events to the initial target of the drag.
+  // If Lock is entered it supercedes any in progress Capture.
+  if (succeeded && render_view_impl_->webwidget())
+    render_view_impl_->webwidget()->mouseCaptureLost();
+}