Adds DevTools commands for forced viewport override.

third_party/WebKit/Source/web/WebViewImpl.h

 /*
  * Copyright (C) 2010 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 284 matching lines @@
     void resetScaleStateImmediately();
 
     HitTestResult coreHitTestResultAt(const WebPoint&);
     void invalidateRect(const IntRect&);
 
     void setIgnoreInputEvents(bool newValue);
     void setBaseBackgroundColor(WebColor);
     void setBackgroundColorOverride(WebColor);
     void setZoomFactorOverride(float);
     void setCompositorDeviceScaleFactorOverride(float);
-    void setRootLayerTransform(const WebSize& offset, float scale);
+    void setRootLayerTransform(const TransformationMatrix&);
+    TransformationMatrix getRootLayerTransformForTesting() const;
+
+    // Returns the original device scale factor when overridden by DevTools, or
+    // deviceScaleFactor() otherwise.
+    float compositorDeviceScaleFactor() const;
 
     Color baseBackgroundColor() const { return m_baseBackgroundColor; }
 
     WebColor backgroundColorOverride() const { return m_backgroundColorOverride; }
 
     Frame* focusedCoreFrame() const;
 
     // Returns the currently focused Element or null if no element has focus.
     Element* focusedElement() const;
 
@@ skipping 61 matching lines @@
 
     // Indicates two things:
     //   1) This view may have a new layout now.
     //   2) Calling updateAllLifecyclePhases() is a no-op.
     // After calling WebWidget::updateAllLifecyclePhases(), expect to get this notification
     // unless the view did not need a layout.
     void layoutUpdated(WebLocalFrameImpl*);
 
     void didChangeContentsSize();
     void pageScaleFactorChanged();
+    void mainFrameScrollOffsetChanged();
 
     // Returns true if popup menus should be rendered by the browser, false if
     // they should be rendered by WebKit (which is the default).
     static bool useExternalPopupMenus();
 
     bool shouldAutoResize() const
     {
         return m_shouldAutoResize;
     }
 
@@ skipping 283 matching lines @@
     bool m_enableFakePageScaleAnimationForTesting;
     IntPoint m_fakePageScaleAnimationTargetPosition;
     float m_fakePageScaleAnimationPageScaleFactor;
     bool m_fakePageScaleAnimationUseAnchor;
 
     bool m_doingDragAndDrop;
 
     bool m_ignoreInputEvents;
 
     float m_compositorDeviceScaleFactorOverride;
-    WebSize m_rootLayerOffset;
-    float m_rootLayerScale;
+    TransformationMatrix m_rootLayerTransform;
 
     // Webkit expects keyPress events to be suppressed if the associated keyDown
     // event was handled. Safari implements this behavior by peeking out the
     // associated WM_CHAR event if the keydown was handled. We emulate
     // this behavior by setting this flag if the keyDown was handled.
     bool m_suppressNextKeypressEvent;
 
     // Represents whether or not this object should process incoming IME events.
     bool m_imeAcceptEvents;
 
@@ skipping 77 matching lines @@
     Persistent<ResizeViewportAnchor> m_resizeViewportAnchor;
 };
 
 // We have no ways to check if the specified WebView is an instance of
 // WebViewImpl because WebViewImpl is the only implementation of WebView.
 DEFINE_TYPE_CASTS(WebViewImpl, WebView, webView, true, true);
 
 } // namespace blink
 
 #endif