DevTools: introduce screencast experiment.

Source/devtools/front_end/ScreencastView.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 12 matching lines @@
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 /**
  * @constructor
+ * @extends {WebInspector.View}
  */
-WebInspector.WorkspaceController = function(workspace)
+WebInspector.ScreencastView = function()
 {
-    this._workspace = workspace;
-    WebInspector.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.InspectedURLChanged, this._inspectedURLChanged, this);
-    window.addEventListener("focus", this._windowFocused.bind(this), false);
+    WebInspector.View.call(this);
+    this.element.addStyleClass("fill");
+    this._isCasting = false;
+    this._imageElement = this.element.createChild("img");
+    WebInspector.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.ScreencastFrame, this._screencastFrame, this);
 }
 
-WebInspector.WorkspaceController.prototype = {
+WebInspector.ScreencastView.prototype = {
+    wasShown: function()
+    {
+        this.startCasting();
+    },
+
+    willHide: function()
+    {
+        this.stopCasting();
+    },
+
+    startCasting: function()
+    {
+        if (this._isCasting)
+            return;
+        this._isCasting = true;
+        PageAgent.startScreencast("jpeg", 80, 0.7);
+    },
+
+    stopCasting: function()
+    {
+        if (!this._isCasting)
+            return;
+        this._isCasting = false;
+        PageAgent.stopScreencast();
+    },
+
     /**
      * @param {WebInspector.Event} event
      */
-    _inspectedURLChanged: function(event)
+    _screencastFrame: function(event)
     {
-        WebInspector.Revision.filterOutStaleRevisions();
+        var base64Data = /** type {string} */(event.data);
+        this._imageElement.src = "data:image/jpg;base64," + base64Data;
     },
 
-    /**
-     * @param {Event} event
-     */
-    _windowFocused: function(event)
-    {
-        if (!WebInspector.experimentsSettings.refreshFileSystemsOnFocus.isEnabled())
-            return;
-        if (this._fileSystemRefreshTimeout)
-            return;
-        this._fileSystemRefreshTimeout = setTimeout(refreshFileSystems.bind(this), 1000);
-
-        function refreshFileSystems()
-        {
-            delete this._fileSystemRefreshTimeout;
-            var projects = this._workspace.projects();
-            for (var i = 0; i < projects.length; ++i)
-                projects[i].refresh("/");
-        }
-    }
+    __proto__: WebInspector.View.prototype
 }
-
-/**
- * @type {?WebInspector.WorkspaceController}
- */
-WebInspector.workspaceController = null;
-