Adds scroll position/scale emulation to DevTools.

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 51 matching lines @@
 #include "web/StorageClientImpl.h"
 #include "web/WebExport.h"
 #include "wtf/Compiler.h"
 #include "wtf/HashSet.h"
 #include "wtf/RefCounted.h"
 #include "wtf/Vector.h"
 #include <memory>
 
 namespace blink {
 
+class CompositorMutatorImpl;
 class DataObject;
 class DevToolsEmulator;
 class Frame;
 class FullscreenController;
 class InspectorOverlay;
 class LinkHighlightImpl;
 class PageOverlay;
 class PageScaleConstraintsSet;
 class PaintLayerCompositor;
+class ScrollAndScaleEmulator;
 class TopControls;
 class UserGestureToken;
 class WebActiveGestureAnimation;
 class WebDevToolsAgentImpl;
 class WebElement;
 class WebLayerTreeView;
 class WebLocalFrame;
 class WebLocalFrameImpl;
 class WebImage;
-class CompositorMutatorImpl;
 class WebPagePopupImpl;
 class WebPlugin;
 class WebRemoteFrame;
 class WebSelection;
 class WebSettingsImpl;
 class WebViewScheduler;
 
 class WEB_EXPORT WebViewImpl final : WTF_NON_EXPORTED_BASE(public WebView)
     , public RefCounted<WebViewImpl>
     , WTF_NON_EXPORTED_BASE(public WebGestureCurveTarget)
@@ skipping 422 matching lines @@
     double lastFrameTimeMonotonic() const { return m_lastFrameTimeMonotonic; }
 
     ChromeClientImpl& chromeClient() const { return *m_chromeClientImpl.get(); }
 
 private:
     InspectorOverlay* inspectorOverlay();
 
     void setPageScaleFactorAndLocation(float, const FloatPoint&);
     void propagateZoomFactorToLocalFrameRoots(Frame*, float);
 
+    // Override the page scale and scroll positions of main frame and visual viewport.
+    void setScrollAndScaleOverride(const WebDeviceEmulationParams&);
+
+    // Clear the page scale and scroll position overrides.
+    void clearScrollAndScaleOverride();
+
     void scrollAndRescaleViewports(float scaleFactor, const IntPoint& mainFrameOrigin, const FloatPoint& visualViewportOrigin);
 
     float maximumLegiblePageScale() const;
     void refreshPageScaleFactorAfterLayout();
     IntSize contentsSize() const;
 
     void performResize();
     void resizeViewWhileAnchored(FrameView*, float topControlsHeight, bool topControlsShrinkLayout);
 
     // Overrides the compositor visibility. See the description of
@@ skipping 125 matching lines @@
     float m_doubleTapZoomPageScaleFactor;
     // Have we sent a double-tap zoom and not yet heard back the scale?
     bool m_doubleTapZoomPending;
 
     // Used for testing purposes.
     bool m_enableFakePageScaleAnimationForTesting;
     IntPoint m_fakePageScaleAnimationTargetPosition;
     float m_fakePageScaleAnimationPageScaleFactor;
     bool m_fakePageScaleAnimationUseAnchor;
 
+    RefPtr<ScrollAndScaleEmulator> m_scrollAndScaleEmulator;

[bokan, 2016/07/04 22:44:09]

I think this should move to FrameHost (see reply to comment on earlier
patchset).

[Eric Seckler, 2016/07/05 16:46:51]

Done.

+
     bool m_doingDragAndDrop;
 
     bool m_ignoreInputEvents;
 
     float m_compositorDeviceScaleFactorOverride;
     WebSize m_rootLayerOffset;
     float m_rootLayerScale;
 
     // Webkit expects keyPress events to be suppressed if the associated keyDown
     // event was handled. Safari implements this behavior by peeking out the
@@ skipping 82 matching lines @@
     bool m_overrideCompositorVisibility;
 };
 
 // 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