Adds scroll position/scale emulation to DevTools.

third_party/WebKit/Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 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 401 matching lines @@
     , m_zoomLevel(0)
     , m_minimumZoomLevel(zoomFactorToZoomLevel(minTextSizeMultiplier))
     , m_maximumZoomLevel(zoomFactorToZoomLevel(maxTextSizeMultiplier))
     , m_zoomFactorForDeviceScaleFactor(0.f)
     , m_maximumLegibleScale(1)
     , m_doubleTapZoomPageScaleFactor(0)
     , m_doubleTapZoomPending(false)
     , m_enableFakePageScaleAnimationForTesting(false)
     , m_fakePageScaleAnimationPageScaleFactor(0)
     , m_fakePageScaleAnimationUseAnchor(false)
+    , m_scrollOverrideEnabled(false)
     , m_doingDragAndDrop(false)
     , m_ignoreInputEvents(false)
     , m_compositorDeviceScaleFactorOverride(0)
     , m_rootLayerScale(1)
     , m_suppressNextKeypressEvent(false)
     , m_imeAcceptEvents(true)
     , m_operationsAllowed(WebDragOperationNone)
     , m_dragOperation(WebDragOperationNone)
     , m_devToolsEmulator(nullptr)
     , m_isTransparent(false)
@@ skipping 1379 matching lines @@
     // viewport with the top controls shown.
     IntSize ICBSize = m_size;
     if (RuntimeEnabledFeatures::inertTopControlsEnabled() && !topControls().shrinkViewport())
         ICBSize.expand(0, -topControls().height());
 
     pageScaleConstraintsSet().didChangeInitialContainingBlockSize(ICBSize);
 
     updatePageDefinedViewportConstraints(mainFrameImpl()->frame()->document()->viewportDescription());
     updateMainFrameLayoutSize();
 
-    page()->frameHost().visualViewport().setSize(m_size);
+    if (!(m_scrollOverrideEnabled
+        && (m_scrollOverrideParams.visualViewportSize.width
+            || m_scrollOverrideParams.visualViewportSize.height))) {
+        page()->frameHost().visualViewport().setSize(m_size);
+    }
 
     if (mainFrameImpl()->frameView()) {
         if (!mainFrameImpl()->frameView()->needsLayout())
             postLayoutResize(mainFrameImpl());
     }
 }
 
 void WebViewImpl::updateTopControlsState(WebTopControlsState constraint, WebTopControlsState current, bool animate)
 {
     topControls().updateConstraints(constraint);
@@ skipping 1326 matching lines @@
 }
 
 float WebViewImpl::pageScaleFactor() const
 {
     if (!page())
         return 1;
 
     return page()->frameHost().visualViewport().scale();
 }
 
+WebPoint WebViewImpl::mainFrameOffset() const
+{
+    if (!page() || !mainFrameImpl())
+        return WebPoint();
+
+    FrameView* view = mainFrameImpl()->frameView();
+    if (!view)
+        return WebPoint();
+
+    return view->scrollPosition();
+}
+
 float WebViewImpl::clampPageScaleFactorToLimits(float scaleFactor) const
 {
     return pageScaleConstraintsSet().finalConstraints().clampToConstraints(scaleFactor);
 }
 
 void WebViewImpl::setVisualViewportOffset(const WebFloatPoint& offset)
 {
     DCHECK(page());
     page()->frameHost().visualViewport().setLocation(offset);
 }
 
 WebFloatPoint WebViewImpl::visualViewportOffset() const
 {
     DCHECK(page());
     return page()->frameHost().visualViewport().visibleRect().location();
 }
 
 WebFloatSize WebViewImpl::visualViewportSize() const
 {
     DCHECK(page());
     return page()->frameHost().visualViewport().visibleRect().size();
 }
 
+void WebViewImpl::setScrollOverride(const WebDeviceEmulationParams& params)
+{
+    if (m_scrollOverrideEnabled && m_scrollOverrideParams == params)
+        return;
+
+    if (!page())
+        return;
+
+    if (!mainFrameImpl())
+        return;
+
+    FrameView * view = mainFrameImpl()->frameView();
+    if (!view)
+        return;
+
+    m_scrollOverrideEnabled = true;
+    m_scrollOverrideParams = params;
+
+    view->setScrollOverride(DoublePoint(
+        m_scrollOverrideParams.scrollPosition.x, m_scrollOverrideParams.scrollPosition.y));
+    page()->frameHost().visualViewport().setScaleAndScrollOverride(
+        m_scrollOverrideParams.visualViewportScale,
+        FloatPoint(
+            m_scrollOverrideParams.visualViewportPosition.x,
+            m_scrollOverrideParams.visualViewportPosition.y));
+}
+
+void WebViewImpl::clearScrollOverride()
+{
+    if (!m_scrollOverrideEnabled)
+        return;
+
+    if (!page())
+        return;
+
+    if (!mainFrameImpl())
+        return;
+
+    FrameView * view = mainFrameImpl()->frameView();
+    if (!view)
+        return;
+
+    m_scrollOverrideEnabled = false;
+
+    view->clearScrollOverride();
+    page()->frameHost().visualViewport().clearScaleAndScrollOverride();
+
+    resetScrollAndScaleState();
+}
+
 void WebViewImpl::scrollAndRescaleViewports(float scaleFactor,
     const IntPoint& mainFrameOrigin,
     const FloatPoint& visualViewportOrigin)
 {
     if (!page())
         return;
 
     if (!mainFrameImpl())
         return;
 
@@ skipping 640 matching lines @@
     m_rootLayerScale = rootLayerScale;
     m_rootLayerOffset = rootLayerOffset;
     if (mainFrameImpl())
         mainFrameImpl()->setInputEventsTransformForEmulation(m_rootLayerOffset, m_rootLayerScale);
     updateRootLayerTransform();
 }
 
 void WebViewImpl::enableDeviceEmulation(const WebDeviceEmulationParams& params)
 {
     m_devToolsEmulator->enableDeviceEmulation(params);
+    setScrollOverride(params);
 }
 
 void WebViewImpl::disableDeviceEmulation()
 {
+    clearScrollOverride();
     m_devToolsEmulator->disableDeviceEmulation();
 }
 
 WebAXObject WebViewImpl::accessibilityObject()
 {
     if (!mainFrameImpl())
         return WebAXObject();
 
     Document* document = mainFrameImpl()->frame()->document();
     return WebAXObject(toAXObjectCacheImpl(document->axObjectCache())->root());
@@ skipping 688 matching lines @@
 {
     // TODO(oshima): Investigate if this should return the ScreenInfo's scale factor rather than
     // page's scale factor, which can be 1 in use-zoom-for-dsf mode.
     if (!page())
         return 1;
 
     return page()->deviceScaleFactor();
 }
 
 } // namespace blink