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

content/renderer/render_widget.h

Index: content/renderer/render_widget.h
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index 5eecc23c2729d62504f4a4ed8ebf4fef2d0cd047..e2858c0cf09b6182025d840fa103624cab9cfdc7 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -27,6 +27,8 @@
 #include "content/renderer/input/render_widget_input_handler.h"
 #include "content/renderer/input/render_widget_input_handler_delegate.h"
 #include "content/renderer/message_delivery_policy.h"
+#include "content/renderer/mouse_lock_dispatcher.h"
+#include "content/renderer/render_widget_mouse_lock_dispatcher.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_sender.h"
 #include "third_party/WebKit/public/platform/WebDisplayMode.h"
@@ -259,6 +261,9 @@ class CONTENT_EXPORT RenderWidget
   void showImeIfNeeded() override;
   void convertViewportToWindow(blink::WebRect* rect) override;
   void convertWindowToViewport(blink::WebFloatRect* rect) override;
+  bool requestPointerLock() override;
+  void requestPointerUnlock() override;
+  bool isPointerLocked() override;
 
   // Override point to obtain that the current input method state and caret
   // position.
@@ -363,6 +368,10 @@ class CONTENT_EXPORT RenderWidget
   // Indicates whether this widget has focus.
   bool has_focus() const { return has_focus_; }
 
+  MouseLockDispatcher* mouse_lock_dispatcher() {
+    return mouse_lock_dispatcher_.get();
+  }
+
  protected:
   // Friend RefCounted so that the dtor can be non-public. Using this class
   // without ref-counting is an error.
@@ -398,7 +407,8 @@ class CONTENT_EXPORT RenderWidget
   // Called by Init and subclasses to perform initialization.
   bool DoInit(int32_t opener_id,
               blink::WebWidget* web_widget,
-              IPC::SyncMessage* create_widget_message);
+              IPC::SyncMessage* create_widget_message,
+              bool should_add_route);

[scheib, 2016/05/19 00:38:58]

Is this part of the mouse lock move? I didn't follow this part of the change.

[lfg, 2016/05/19 23:54:06]

It's not strictly necessary, but since I've moved the mouse_lock_dispatcher to
RenderWidget, we still need to initialize it during the RenderView
initialization. Instead of adding a new function that does the same as
RenderWidget::DoInit without adding the route, I've just added a parameter here.
I feel this is a bit cleaner.

In the future, we'd like to have RenderView be just a renderer object holding
the state of the page, and not having a RenderViewHost counterpart (so no route
anymore).

 
   // Sets whether this RenderWidget has been swapped out to be displayed by
   // a RenderWidget in a different process.  If so, no new IPC messages will be
@@ -757,6 +767,12 @@ class CONTENT_EXPORT RenderWidget
   std::unique_ptr<scheduler::RenderWidgetSchedulingState>
       render_widget_scheduling_state_;
 
+  // Mouse Lock dispatcher attached to this view.
+  std::unique_ptr<RenderWidgetMouseLockDispatcher> mouse_lock_dispatcher_;
+
+  // Wraps the |webwidget_| as a MouseLockDispatcher::LockTarget interface.
+  std::unique_ptr<MouseLockDispatcher::LockTarget> webwidget_mouse_lock_target_;
+
  private:
   // When emulated, this returns original device scale factor.
   float GetOriginalDeviceScaleFactor() const;