Adds scroll position/scale emulation to DevTools.

third_party/WebKit/Source/core/frame/FrameHost.cpp

 /*
  * 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 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "core/frame/FrameHost.h"
 
 #include "core/dom/custom/CustomElementReactionStack.h"
 #include "core/frame/EventHandlerRegistry.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/PageScaleConstraints.h"
 #include "core/frame/PageScaleConstraintsSet.h"
+#include "core/frame/ScrollAndScaleEmulator.h"
 #include "core/frame/TopControls.h"
 #include "core/frame/VisualViewport.h"
 #include "core/inspector/ConsoleMessageStorage.h"
 #include "core/page/Page.h"
 #include "core/page/scrolling/OverscrollController.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebScheduler.h"
 
 namespace blink {
 
@@ skipping 149 matching lines @@
 
 DEFINE_TRACE(FrameHost)
 {
     visitor->trace(m_page);
     visitor->trace(m_topControls);
     visitor->trace(m_visualViewport);
     visitor->trace(m_overscrollController);
     visitor->trace(m_eventHandlerRegistry);
     visitor->trace(m_consoleMessageStorage);
     visitor->trace(m_customElementReactionStack);
+    visitor->trace(m_scrollAndScaleEmulator);
 }
 
 #if ENABLE(ASSERT)
 void checkFrameCountConsistency(int expectedFrameCount, Frame* frame)
 {
     ASSERT(expectedFrameCount >= 0);
 
     int actualFrameCount = 0;
     for (; frame; frame = frame->tree().traverseNext())
         ++actualFrameCount;
@@ skipping 45 matching lines @@
         return;
 
     FrameView* rootView = page().deprecatedLocalMainFrame()->view();
 
     if (!rootView)
         return;
 
     rootView->setNeedsLayout();
 }
 
+void FrameHost::setScrollAndScaleOverride(const IntPoint& framePosition, const DoublePoint& visualViewportPosition, float pageScale)
+{
+    if (!page().mainFrame() || !page().mainFrame()->isLocalFrame())
+        return;
+
+    if (!m_scrollAndScaleEmulator)
+        m_scrollAndScaleEmulator = ScrollAndScaleEmulator::create(this);
+
+    m_scrollAndScaleEmulator->update(
+        framePosition, visualViewportPosition, pageScale);
+}
+
+void FrameHost::clearScrollAndScaleOverride()
+{
+    if (!m_scrollAndScaleEmulator)
+        return;
+
+    m_scrollAndScaleEmulator->clear();
+    m_scrollAndScaleEmulator = nullptr;
+}
+
 } // namespace blink