Implement pointer lock API for out-of-process iframes.

content/browser/web_contents/web_contents_impl.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/browser/web_contents/web_contents_impl.h"
 
 #include <stddef.h>
 
 #include <cmath>
 #include <utility>
@@ skipping 400 matching lines @@
       is_subframe_(false),
       force_disable_overscroll_content_(false),
       last_dialog_suppressed_(false),
       geolocation_service_context_(new GeolocationServiceContext()),
       accessibility_mode_(
           BrowserAccessibilityStateImpl::GetInstance()->accessibility_mode()),
       audio_stream_monitor_(this),
       bluetooth_connected_device_count_(0),
       virtual_keyboard_requested_(false),
       page_scale_factor_is_one_(true),
+      mouse_lock_widget_(nullptr),
       loading_weak_factory_(this),
       weak_factory_(this) {
   frame_tree_.SetFrameRemoveListener(
       base::Bind(&WebContentsImpl::OnFrameRemoved,
                  base::Unretained(this)));
 #if defined(OS_ANDROID)
   media_web_contents_observer_.reset(new MediaWebContentsObserverAndroid(this));
 #else
   media_web_contents_observer_.reset(new MediaWebContentsObserver(this));
 #endif
@@ skipping 1252 matching lines @@
     if (delegate_ && delegate_->EmbedsFullscreenWidget())
       delegate_->ExitFullscreenModeForTab(this);
     FOR_EACH_OBSERVER(WebContentsObserver,
                       observers_,
                       DidDestroyFullscreenWidget());
     fullscreen_widget_process_id_ = ChildProcessHost::kInvalidUniqueID;
     fullscreen_widget_routing_id_ = MSG_ROUTING_NONE;
     if (fullscreen_widget_had_focus_at_shutdown_)
       view_->RestoreFocus();
   }
+
+  if (mouse_lock_widget_ == render_widget_host)
+    mouse_lock_widget_ = nullptr;
 }
 
 void WebContentsImpl::RenderWidgetGotFocus(
     RenderWidgetHostImpl* render_widget_host) {
   // Notify the observers if an embedded fullscreen widget was focused.
   if (delegate_ && render_widget_host && delegate_->EmbedsFullscreenWidget() &&
       render_widget_host->GetView() == GetFullscreenRenderWidgetHostView()) {
     NotifyWebContentsFocused();
   }
 }
@@ skipping 178 matching lines @@
     return blink::WebDisplayModeBrowser;
 
   return delegate_ ? delegate_->GetDisplayMode(this)
                    : blink::WebDisplayModeBrowser;
 }
 
 void WebContentsImpl::RequestToLockMouse(
     RenderWidgetHostImpl* render_widget_host,
     bool user_gesture,
     bool last_unlocked_by_target) {
-  if (render_widget_host != GetRenderViewHost()->GetWidget()) {
+  if (mouse_lock_widget_) {
     render_widget_host->GotResponseToLockMouseRequest(false);
     return;
   }
 
-  if (delegate_)
+  bool widget_in_frame_tree = false;
+  for (FrameTreeNode* node : frame_tree_.Nodes()) {
+    if (node->current_frame_host()->GetRenderWidgetHost() ==
+        render_widget_host) {
+      widget_in_frame_tree = true;
+      break;
+    }
+  }
+
+  if (widget_in_frame_tree && delegate_) {
+    mouse_lock_widget_ = render_widget_host;
     delegate_->RequestToLockMouse(this, user_gesture, last_unlocked_by_target);
-  else
-    GotResponseToLockMouseRequest(false);
+  } else

[nasko, 2016/05/25 21:12:01]

The else clause also needs {} if the if clause has them.

[lfg, 2016/05/31 21:13:20]

Done.

+    render_widget_host->GotResponseToLockMouseRequest(false);
 }
 
 void WebContentsImpl::LostMouseLock(RenderWidgetHostImpl* render_widget_host) {
-  if (!RenderViewHostImpl::From(render_widget_host))
-    return;
+  CHECK(mouse_lock_widget_);
+  mouse_lock_widget_->SendMouseLockLost();
+  mouse_lock_widget_ = nullptr;
 
   if (delegate_)
     delegate_->LostMouseLock();
 }
 
 void WebContentsImpl::ForwardCompositorProto(
     RenderWidgetHostImpl* render_widget_host,
     const std::vector<uint8_t>& proto) {
   if (delegate_)
     delegate_->ForwardCompositorProto(render_widget_host, proto);
@@ skipping 1013 matching lines @@
 }
 
 gfx::Size WebContentsImpl::GetPreferredSize() const {
   return capturer_count_ == 0 ? preferred_size_ : preferred_size_for_capture_;
 }
 
 bool WebContentsImpl::GotResponseToLockMouseRequest(bool allowed) {
   if (GetBrowserPluginGuest())
     return GetBrowserPluginGuest()->LockMouse(allowed);
 
-  return GetRenderViewHost()
-             ? GetRenderViewHost()->GetWidget()->GotResponseToLockMouseRequest(
-                   allowed)
-             : false;
+  if (mouse_lock_widget_)
+    return mouse_lock_widget_->GotResponseToLockMouseRequest(allowed);
+  return false;
 }
 
 bool WebContentsImpl::HasOpener() const {
   return GetOpener() != NULL;
 }
 
 WebContentsImpl* WebContentsImpl::GetOpener() const {
   FrameTreeNode* opener_ftn = frame_tree_.root()->opener();
   return opener_ftn ? FromFrameTreeNode(opener_ftn) : nullptr;
 }
@@ skipping 2087 matching lines @@
   for (RenderViewHost* render_view_host : render_view_host_set)
     render_view_host->OnWebkitPreferencesChanged();
 }
 
 void WebContentsImpl::SetJavaScriptDialogManagerForTesting(
     JavaScriptDialogManager* dialog_manager) {
   dialog_manager_ = dialog_manager;
 }
 
 }  // namespace content