[DevTools] Explicitly enable/disable Page.viewportChanged protocol event.

Source/core/inspector/InspectorPageAgent.cpp

 /*
  * Copyright (C) 2011 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 87 matching lines @@
 static const char deviceOffsetY[] = "deviceOffsetY";
 static const char pageAgentShowFPSCounter[] = "pageAgentShowFPSCounter";
 static const char pageAgentContinuousPaintingEnabled[] = "pageAgentContinuousPaintingEnabled";
 static const char pageAgentShowPaintRects[] = "pageAgentShowPaintRects";
 static const char pageAgentShowDebugBorders[] = "pageAgentShowDebugBorders";
 static const char pageAgentShowScrollBottleneckRects[] = "pageAgentShowScrollBottleneckRects";
 static const char touchEventEmulationEnabled[] = "touchEventEmulationEnabled";
 static const char pageAgentEmulatedMedia[] = "pageAgentEmulatedMedia";
 static const char showSizeOnResize[] = "showSizeOnResize";
 static const char showGridOnResize[] = "showGridOnResize";
+static const char viewportChangedEventEnabled[] = "viewportChangedEventEnabled";
 }
 
 namespace {
 
 KURL urlWithoutFragment(const KURL& url)
 {
     KURL result = url;
     result.removeFragmentIdentifier();
     return result;
 }
@@ skipping 692 matching lines @@
     m_state->setLong(PageAgentState::pageAgentScreenHeightOverride, height);
     m_state->setDouble(PageAgentState::pageAgentDeviceScaleFactorOverride, deviceScaleFactor);
     m_state->setBoolean(PageAgentState::pageAgentEmulateViewport, emulateViewport);
     m_state->setBoolean(PageAgentState::pageAgentFitWindow, fitWindow);
     m_state->setDouble(PageAgentState::deviceScale, scale);
     m_state->setDouble(PageAgentState::deviceOffsetX, offsetX);
     m_state->setDouble(PageAgentState::deviceOffsetY, offsetY);
     updateViewMetricsFromState();
 }
 
+void InspectorPageAgent::setViewportChangedEventEnabled(ErrorString*, bool enabled)
+{
+    if (m_state->getBoolean(PageAgentState::viewportChangedEventEnabled) != enabled) {
+        m_state->setBoolean(PageAgentState::viewportChangedEventEnabled, enabled);
+        if (enabled)
+            viewportChanged();
+    }
+}
+
 void InspectorPageAgent::clearDeviceMetricsOverride(ErrorString*)
 {
     if (m_state->getBoolean(PageAgentState::deviceMetricsOverrideEnabled)) {
         m_state->setBoolean(PageAgentState::deviceMetricsOverrideEnabled, false);
         updateViewMetricsFromState();
     }
 }
 
 void InspectorPageAgent::resetScrollAndPageScaleFactor(ErrorString*)
 {
@@ skipping 329 matching lines @@
 
 void InspectorPageAgent::didScroll()
 {
     if (m_enabled)
         m_overlay->update();
     viewportChanged();
 }
 
 void InspectorPageAgent::viewportChanged()
 {
-    if (!m_enabled)
+    if (!m_enabled || !m_state->getBoolean(PageAgentState::viewportChangedEventEnabled))
         return;
     IntSize contentsSize = m_page->deprecatedLocalMainFrame()->view()->contentsSize();
     IntRect viewRect = m_page->deprecatedLocalMainFrame()->view()->visibleContentRect();
     RefPtr<TypeBuilder::Page::Viewport> viewport = TypeBuilder::Page::Viewport::create()
         .setScrollX(viewRect.x())
         .setScrollY(viewRect.y())
         .setContentsWidth(contentsSize.width())
         .setContentsHeight(contentsSize.height())
         .setPageScaleFactor(m_page->pageScaleFactor());
     m_frontend->viewportChanged(viewport);
@@ skipping 247 matching lines @@
 bool InspectorPageAgent::getEditedResourceContent(const String& url, String* content)
 {
     if (!m_editedResourceContent.contains(url))
         return false;
     *content = m_editedResourceContent.get(url);
     return true;
 }
 
 } // namespace WebCore