[DevTools] Full-size screenshots in device mode.

third_party/WebKit/Source/devtools/front_end/sdk/ScreenCaptureModel.js

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @implements {Protocol.PageDispatcher}
  */
 SDK.ScreenCaptureModel = class extends SDK.SDKModel {
   /**
    * @param {!SDK.Target} target
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     var promise = new Promise(callback => fulfill = callback);
     this._agent.captureScreenshot(format, quality, (error, content) => {
       if (error)
         console.error(error);
       fulfill(error ? null : content);
     });
     return promise;
   }
 
   /**
+   * @return {!Promise<?{width: number, height: number}>}
+   */
+  fetchContentSize() {
+    var fulfill;
+    var promise = new Promise(callback => fulfill = callback);
+    this._agent.getLayoutMetrics((error, layoutViewport, visualViewport, contentSize) => {
+      fulfill(error ? null : {width: contentSize.width, height: contentSize.height});
+    });
+    return promise;
+  }
+
+  /**
    * @override
    * @param {string} data
    * @param {!Protocol.Page.ScreencastFrameMetadata} metadata
    * @param {number} sessionId
    */
   screencastFrame(data, metadata, sessionId) {
     this._agent.screencastFrameAck(sessionId);
     if (this._onScreencastFrame)
       this._onScreencastFrame.call(null, data, metadata);
   }
@@ skipping 113 matching lines @@
   }
 
   /**
    * @override
    */
   navigationRequested() {
   }
 };
 
 SDK.SDKModel.register(SDK.ScreenCaptureModel, SDK.Target.Capability.ScreenCapture);