Notify WebMediaPlayer when HTML video enters full screen.

third_party/WebKit/Source/core/html/HTMLMediaElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
index f8f4ba806168d75890c3c02087971e5f04f3daac..6320bc2c923848a35b2f3c2a7e8924b6918696ee 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -451,6 +451,7 @@ HTMLMediaElement::HTMLMediaElement(const QualifiedName& tagName, Document& docum
     , m_autoplayHelper(AutoplayExperimentHelper::create(m_autoplayHelperClient.get()))
     , m_remotePlaybackClient(nullptr)
     , m_autoplayVisibilityObserver(nullptr)
+    , m_isMediaInFullscreen(false)
 {
     ThreadState::current()->registerPreFinalizer(this);
 
@@ -3318,6 +3319,13 @@ void HTMLMediaElement::willStopBeingFullscreenElement()
     m_inOverlayFullscreenVideo = false;
 }
 
+void HTMLMediaElement::updateMediaInFullscreen(bool isFullscreen)
+{
+    m_isMediaInFullscreen = isFullscreen;
+    if (webMediaPlayer())
+        webMediaPlayer()->updateMediaInFullscreen(isFullscreen);
+}
+
 WebLayer* HTMLMediaElement::platformLayer() const
 {
     return m_webLayer;