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

third_party/WebKit/Source/web/WebViewImpl.cpp

Index: third_party/WebKit/Source/web/WebViewImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebViewImpl.cpp b/third_party/WebKit/Source/web/WebViewImpl.cpp
index fad565d27c6eaef57d89c1087056567fb40a7363..afbaa6d6a83843a3783389694f85c21396cc2c64 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.cpp
+++ b/third_party/WebKit/Source/web/WebViewImpl.cpp
@@ -140,6 +140,7 @@
 #include "public/web/WebElement.h"
 #include "public/web/WebFrame.h"
 #include "public/web/WebFrameClient.h"
+#include "public/web/WebFrameWidget.h"
 #include "public/web/WebHitTestResult.h"
 #include "public/web/WebInputElement.h"
 #include "public/web/WebMeaningfulLayout.h"
@@ -4445,18 +4446,30 @@ void WebViewImpl::setVisibilityState(WebPageVisibilityState visibilityState,
 
 bool WebViewImpl::requestPointerLock()
 {
-    return m_client && m_client->requestPointerLock();
+    if (WebFrameWidget* widget = mainFrameImpl()->frameWidget()) {

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

It doesn't seem like anyone still needs to call this, so maybe we can just
remove it.

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

Done.

+        if (WebWidgetClient* client = widget->client())
+            return client->requestPointerLock();
+    }
+
+    return false;
 }
 
 void WebViewImpl::requestPointerUnlock()
 {
-    if (m_client)
-        m_client->requestPointerUnlock();
+    if (WebFrameWidget* widget = mainFrameImpl()->frameWidget()) {
+        if (WebWidgetClient* client = widget->client())
+            client->requestPointerUnlock();
+    }
 }
 
 bool WebViewImpl::isPointerLocked()
 {
-    return m_client && m_client->isPointerLocked();
+    if (WebFrameWidget* widget = mainFrameImpl()->frameWidget()) {
+        if (WebWidgetClient* client = widget->client())
+            return client->isPointerLocked();
+    }
+
+    return false;
 }
 
 void WebViewImpl::pointerLockMouseEvent(const WebInputEvent& event)