[DevTools] Switch from DIP to CSS pixels in device mode.

Source/core/inspector/InspectorPageAgent.cpp

Index: Source/core/inspector/InspectorPageAgent.cpp
diff --git a/Source/core/inspector/InspectorPageAgent.cpp b/Source/core/inspector/InspectorPageAgent.cpp
index 7df66fff537faf4b7c98ff3d6454b99637d17882..451c012ffe32676aa4b71dab7a61c74323b981cd 100644
--- a/Source/core/inspector/InspectorPageAgent.cpp
+++ b/Source/core/inspector/InspectorPageAgent.cpp
@@ -963,6 +963,7 @@ void InspectorPageAgent::didCommitLoad(LocalFrame*, DocumentLoader* loader)
             m_inspectorResourceContentLoader->stop();
     }
     m_frontend->frameNavigated(buildObjectForFrame(loader->frame()));
+    viewportChanged();
 }
 
 void InspectorPageAgent::frameAttachedToParent(LocalFrame* frame)
@@ -1137,12 +1138,29 @@ void InspectorPageAgent::didLayout(RenderObject*)
     if (!m_enabled)
         return;
     m_overlay->update();
+    viewportChanged();
 }
 
 void InspectorPageAgent::didScroll()
 {
     if (m_enabled)
         m_overlay->update();
+    viewportChanged();
+}
+
+void InspectorPageAgent::viewportChanged()
+{
+    if (!m_enabled)
+        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);
 }
 
 void InspectorPageAgent::didResizeMainFrame()
@@ -1152,6 +1170,7 @@ void InspectorPageAgent::didResizeMainFrame()
         m_overlay->showAndHideViewSize(m_state->getBoolean(PageAgentState::showGridOnResize));
 #endif
     m_frontend->frameResized();
+    viewportChanged();
 }
 
 void InspectorPageAgent::didRecalculateStyle(int)
@@ -1160,6 +1179,13 @@ void InspectorPageAgent::didRecalculateStyle(int)
         m_overlay->update();
 }
 
+void InspectorPageAgent::deviceOrPageScaleFactorChanged()
+{
+    if (m_enabled)
+        m_overlay->update();
+    viewportChanged();
+}
+
 void InspectorPageAgent::scriptsEnabled(bool isEnabled)
 {
     if (m_ignoreScriptsEnabledNotification)