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

Source/core/inspector/InspectorPageAgent.h

Index: Source/core/inspector/InspectorPageAgent.h
diff --git a/Source/core/inspector/InspectorPageAgent.h b/Source/core/inspector/InspectorPageAgent.h
index bbcc100ecf8882935e05cdf04bdf1adc6e500176..b7f689cb8d404fcc8729d9bca34074a7d542c18a 100644
--- a/Source/core/inspector/InspectorPageAgent.h
+++ b/Source/core/inspector/InspectorPageAgent.h
@@ -162,6 +162,7 @@ public:
     String scriptPreprocessorSource() { return m_scriptPreprocessorSource; }
     const AtomicString& resourceSourceMapURL(const String& url);
     bool deviceMetricsOverrideEnabled();
+    void deviceOrPageScaleFactorChanged();
     static DocumentLoader* assertDocumentLoader(ErrorString*, LocalFrame*);
     InspectorResourceContentLoader* resourceContentLoader() { return m_inspectorResourceContentLoader.get(); }
     void clearEditedResourcesContent();
@@ -182,6 +183,8 @@ private:
 
     static bool dataContent(const char* data, unsigned size, const String& textEncodingName, bool withBase64Encode, String* result);
 
+    void viewportChanged();
+
     PassRefPtr<TypeBuilder::Page::Frame> buildObjectForFrame(LocalFrame*);
     PassRefPtr<TypeBuilder::Page::FrameResourceTree> buildObjectForFrameTree(LocalFrame*);
     Page* m_page;