diff --git c/WebCore/html/HTMLMediaElement.cpp i/WebCore/html/HTMLMediaElement.cpp
index e9dc263..1b0f192 100644
--- c/WebCore/html/HTMLMediaElement.cpp
+++ i/WebCore/html/HTMLMediaElement.cpp
@@ -1943,6 +1943,9 @@ void HTMLMediaElement::updatePlayState()
         setDisplayMode(Video);

         if (playerPaused) {
+            if (m_player->shouldForceFullscreenVideoPlayback() && !m_isFullscreen)
+                enterFullscreen();
+
             // Set rate before calling play in case the rate was set before the media engine was setup.
             // The media engine should just stash the rate since it isn't already playing.
             m_player->setRate(m_playbackRate);
@@ -2259,6 +2262,9 @@ void HTMLMediaElement::exitFullscreen()
     ASSERT(m_isFullscreen);
     m_isFullscreen = false;
     if (document() && document()->page()) {
+        if (m_player->shouldForceFullscreenVideoPlayback())
+            pauseInternal();
+
         document()->page()->chrome()->client()->exitFullscreenForNode(this);
         scheduleEvent(eventNames().webkitendfullscreenEvent);
         if (renderer())
diff --git c/WebCore/page/ChromeClient.h i/WebCore/page/ChromeClient.h
index 7542615..66313d2 100644
--- c/WebCore/page/ChromeClient.h
+++ i/WebCore/page/ChromeClient.h
@@ -244,6 +244,10 @@ namespace WebCore {
         virtual void enterFullScreenForElement(Element*) { }
         virtual void exitFullScreenForElement(Element*) { }
 #endif
+
+#if ENABLE(VIDEO)
+        virtual bool shouldForceFullScreenVideoPlayback() { return false; }
+#endif

 #if ENABLE(TILED_BACKING_STORE)
         virtual IntRect visibleRectForTiledBackingStore() const { return IntRect(); }
diff --git c/WebCore/platform/graphics/MediaPlayer.cpp i/WebCore/platform/graphics/MediaPlayer.cpp
index 2a9e64e..6c2cdb7 100644
--- c/WebCore/platform/graphics/MediaPlayer.cpp
+++ i/WebCore/platform/graphics/MediaPlayer.cpp
@@ -28,6 +28,8 @@
 #if ENABLE(VIDEO)
 #include "MediaPlayer.h"

+#include "Chrome.h"
+#include "ChromeClient.h"
 #include "ContentType.h"
 #include "Document.h"
 #include "Frame.h"
@@ -397,6 +399,18 @@ bool MediaPlayer::supportsFullscreen() const
     return m_private->supportsFullscreen();
 }

+bool MediaPlayer::shouldForceFullscreenVideoPlayback() const
+{
+    Document* doc = document();
+    if (!doc || !doc->page())
+        return false;
+
+    if (doc->page()->chrome()->client()->shouldForceFullScreenVideoPlayback())
+        return true;
+
+    return false;
+}
+
 bool MediaPlayer::supportsSave() const
 {
     return m_private->supportsSave();
@@ -417,12 +431,16 @@ bool MediaPlayer::hasAudio() const
     return m_private->hasAudio();
 }

-bool MediaPlayer::inMediaDocument()
+Document* MediaPlayer::document() const
 {
     Frame* frame = m_frameView ? m_frameView->frame() : 0;
-    Document* document = frame ? frame->document() : 0;
-
-    return document && document->isMediaDocument();
+    return frame ? frame->document() : 0;
+}
+
+bool MediaPlayer::inMediaDocument()
+{
+    Document* doc = document();
+    return doc && doc->isMediaDocument();
 }

 PlatformMedia MediaPlayer::platformMedia() const
diff --git c/WebCore/platform/graphics/MediaPlayer.h i/WebCore/platform/graphics/MediaPlayer.h
index c2d0a00..48eca4e 100644
--- c/WebCore/platform/graphics/MediaPlayer.h
+++ i/WebCore/platform/graphics/MediaPlayer.h
@@ -162,6 +162,7 @@ public:
     static bool isAvailable();

     bool supportsFullscreen() const;
+    bool shouldForceFullscreenVideoPlayback() const;
     bool supportsSave() const;
     PlatformMedia platformMedia() const;
 #if USE(ACCELERATED_COMPOSITING)
@@ -279,6 +280,8 @@ private:

     static void initializeMediaEngines();

+    Document* document() const;
+
     MediaPlayerClient* m_mediaPlayerClient;
     OwnPtr<MediaPlayerPrivateInterface*> m_private;
     void* m_currentMediaEngine;