Adds keyboard functionality for videos.

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 9156bba583b6c602b3a8cc84b4db479d0b50a85d..4d89681c04bc37acc4956991ca3315423b0a40bd 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -26,6 +26,7 @@
 
 #include "core/html/HTMLMediaElement.h"
 
+#include <limits>
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/Microtask.h"
 #include "bindings/core/v8/ScriptController.h"
@@ -41,6 +42,7 @@
 #include "core/dom/TaskRunnerHelper.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/events/Event.h"
+#include "core/events/KeyboardEvent.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
@@ -84,6 +86,7 @@
 #include "platform/network/mime/MIMETypeFromURL.h"
 #include "platform/weborigin/SecurityOrigin.h"
 #include "public/platform/Platform.h"
+#include "public/platform/UserMetricsAction.h"
 #include "public/platform/WebAudioSourceProvider.h"
 #include "public/platform/WebContentDecryptionModule.h"
 #include "public/platform/WebInbandTextTrack.h"
@@ -97,7 +100,6 @@
 #include "wtf/MathExtras.h"
 #include "wtf/PtrUtil.h"
 #include "wtf/text/CString.h"
-#include <limits>
 
 #ifndef BLINK_MEDIA_LOG
 #define BLINK_MEDIA_LOG DVLOG(3)
@@ -3642,6 +3644,31 @@ void HTMLMediaElement::ensureMediaControls() {
   assertShadowRootChildren(shadowRoot);
 }
 
+void HTMLMediaElement::defaultEventHandler(Event* event) {
+  if (isFocusedElementInDocument()) {
+    if (event->isKeyboardEvent()) {
+      int key = toKeyboardEvent(event)->keyCode();
+      switch (key) {
+        case ('\r'):
+        case (' '):
+          togglePlayState();
+          return;
+        case (37):
+        case (39):
+          m_mediaControls->timelineElement()->defaultEventHandler(event);
+          m_mediaControls->startHideMediaControlsTimer();
+          return;
+        case (38):
+        case (40):
+          m_mediaControls->volumeSliderElement()->defaultEventHandler(event);
+          m_mediaControls->startHideMediaControlsTimer();
+          return;
+      }
+    }
+  }
+  HTMLElement::defaultEventHandler(event);
+}
+
 void HTMLMediaElement::updateControlsVisibility() {
   if (!isConnected()) {
     if (mediaControls())