Enabling page visibility api in the chrome browser.

BUG=83286
TEST=None.


Review URL: http://codereview.chromium.org/7036019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86569 0039d316-1c4b-4281-b951-d872f2087c98

build/features_override.gypi

@@ -46,6 +46,7 @@
       'ENABLE_OFFLINE_WEB_APPLICATIONS=1',
       'ENABLE_OPENTYPE_SANITIZER=1',
       'ENABLE_ORIENTATION_EVENTS=0',
+      'ENABLE_PAGE_VISIBILITY_API=1',
       'ENABLE_PROGRESS_TAG=1',
       'ENABLE_QUOTA=1',
       'ENABLE_REQUEST_ANIMATION_FRAME=1',

content/renderer/render_view.cc

@@ -3878,6 +3878,7 @@ void RenderView::OnWasHidden() {
   if (webview()) {
     webview()->settings()->setMinimumTimerInterval(
         webkit_glue::kBackgroundTabTimerInterval);
+    webview()->setVisibilityState(WebKit::WebPageVisibilityStateHidden, false);
   }
 
 #if defined(OS_MACOSX)
@@ -3896,6 +3897,7 @@ void RenderView::OnWasRestored(bool needs_repainting) {
   if (webview()) {
     webview()->settings()->setMinimumTimerInterval(
         webkit_glue::kForegroundTabTimerInterval);
+    webview()->setVisibilityState(WebKit::WebPageVisibilityStateVisible, false);
   }
 
 #if defined(OS_MACOSX)
@@ -4096,6 +4098,13 @@ void RenderView::registerProtocolHandler(const WebString& scheme,
                                               title));
 }
 
+WebKit::WebPageVisibilityState RenderView::visibilityState() const {
+  if (is_hidden())
+    return WebKit::WebPageVisibilityStateHidden;
+  else
+    return WebKit::WebPageVisibilityStateVisible;
+}
+
 bool RenderView::IsNonLocalTopLevelNavigation(
     const GURL& url, WebKit::WebFrame* frame, WebKit::WebNavigationType type) {
   // Must be a top level frame.

content/renderer/render_view.h

@@ -35,6 +35,7 @@
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrameClient.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebIconURL.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebNode.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebPageVisibilityState.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebTextDirection.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebViewClient.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebNavigationType.h"
@@ -428,6 +429,7 @@ class RenderView : public RenderWidget,
                                        const WebKit::WebString& base_url,
                                        const WebKit::WebString& url,
                                        const WebKit::WebString& title);
+  virtual WebKit::WebPageVisibilityState visibilityState() const;
 
   // WebKit::WebFrameClient implementation -------------------------------------