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

third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp

Index: third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp b/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
index 4998d018a4b0aa5acf4cb15650c0c993af9e3956..eccc18922c4fee24bdc9668c575116d4112a69f4 100644
--- a/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
+++ b/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
@@ -47,6 +47,7 @@
 #include "core/page/ContextMenuController.h"
 #include "core/page/FocusController.h"
 #include "core/page/Page.h"
+#include "core/page/PointerLockController.h"
 #include "platform/KeyboardCodes.h"
 #include "platform/graphics/CompositorMutatorClient.h"
 #include "public/platform/WebFrameScheduler.h"
@@ -645,6 +646,24 @@ void WebFrameWidgetImpl::didChangeWindowResizerRect()
         m_localRoot->frameView()->windowResizerRectChanged();
 }
 
+void WebFrameWidgetImpl::didAcquirePointerLock()
+{
+    if (page())

[dcheng, 2016/06/04 05:28:56]

Is it actually possible to call this when there's no page()?  I would have
thought that things would have been torn down and callbacks cancelled.

[lfg, 2016/06/06 20:09:43]

No, I don't think it's possible. This check is unnecessary, removed.

+        page()->pointerLockController().didAcquirePointerLock();
+}
+
+void WebFrameWidgetImpl::didNotAcquirePointerLock()
+{
+    if (page())
+        page()->pointerLockController().didNotAcquirePointerLock();
+}
+
+void WebFrameWidgetImpl::didLosePointerLock()
+{
+    if (page())
+        page()->pointerLockController().didLosePointerLock();
+}
+
 void WebFrameWidgetImpl::handleMouseLeave(LocalFrame& mainFrame, const WebMouseEvent& event)
 {
     // FIXME: WebWidget doesn't have the method below.