Cross-process frames should be notified of device scale factor changes.

content/browser/web_contents/web_contents_view.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_H_
 
 #include <string>
 
 #include "base/strings/string16.h"
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/native_widget_types.h"
 
+namespace blink {
+  struct WebScreenInfo;
+}
+
 namespace content {
 class RenderViewHost;
 class RenderWidgetHost;
 class RenderWidgetHostViewBase;
 struct DropData;
 
 // The WebContentsView is an interface that is implemented by the platform-
 // dependent web contents views. The WebContents uses this interface to talk to
 // them.
 class WebContentsView {
  public:
   virtual ~WebContentsView() {}
 
   // Returns the native widget that contains the contents of the tab.
   virtual gfx::NativeView GetNativeView() const = 0;
 
   // Returns the native widget with the main content of the tab (i.e. the main
   // render view host, though there may be many popups in the tab as children of
   // the container).
   virtual gfx::NativeView GetContentNativeView() const = 0;
 
   // Returns the outermost native view. This will be used as the parent for
   // dialog boxes.
   virtual gfx::NativeWindow GetTopLevelNativeWindow() const = 0;
 
+  // The following static method is implemented by each platform.
+  static void GetDefaultScreenInfo(blink::WebScreenInfo* results);
+
+  // Gets screen information for the window associated with this view.
+  virtual void GetScreenInfo(blink::WebScreenInfo* web_screen_info) const = 0;
+
   // Computes the rectangle for the native widget that contains the contents of
   // the tab in the screen coordinate system.
   virtual void GetContainerBounds(gfx::Rect* out) const = 0;
 
   // TODO(brettw) this is a hack. It's used in two places at the time of this
   // writing: (1) when render view hosts switch, we need to size the replaced
   // one to be correct, since it wouldn't have known about sizes that happened
   // while it was hidden; (2) in constrained windows.
   //
   // (1) will be fixed once interstitials are cleaned up. (2) seems like it
@@ skipping 70 matching lines @@
   // true CloseTabAfterEventTracking() is called and the close is not
   // completed.
   virtual bool IsEventTracking() const = 0;
   virtual void CloseTabAfterEventTracking() = 0;
 #endif
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_H_