Add a function to layout.h for getting ScaleFactor of the native view.

content/browser/renderer_host/render_widget_host_view_mac.mm

 // 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.
 
 #include "content/browser/renderer_host/render_widget_host_view_mac.h"
 
 #include <QuartzCore/QuartzCore.h>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 30 matching lines @@
 #import "content/public/browser/render_widget_host_view_mac_delegate.h"
 #include "skia/ext/platform_canvas.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebScreenInfo.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/mac/WebInputEventFactory.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/mac/WebScreenInfoFactory.h"
 #import "third_party/mozilla/ComplexTextInputPanel.h"
 #include "third_party/skia/include/core/SkColor.h"
 #import "ui/base/cocoa/fullscreen_window_manager.h"
 #import "ui/base/cocoa/underlay_opengl_hosting_window.h"
+#include "ui/base/layout.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
 #include "ui/surface/io_surface_support_mac.h"
 #include "webkit/plugins/npapi/webplugin.h"
 
 using content::BackingStoreMac;
 using content::NativeWebKeyboardEvent;
 using content::RenderViewHostImpl;
 using content::RenderWidgetHostImpl;
 using content::RenderWidgetHostViewMac;
 using content::RenderWidgetHostViewMacEditCommandHelper;
 using WebKit::WebInputEvent;
 using WebKit::WebInputEventFactory;
 using WebKit::WebMouseEvent;
 using WebKit::WebMouseWheelEvent;
 using WebKit::WebGestureEvent;
 
 // Declare things that are part of the 10.7 SDK.
 #if !defined(MAC_OS_X_VERSION_10_7) || \
     MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
 @interface NSEvent (LionAPI)
 + (id)addLocalMonitorForEventsMatchingMask:(NSEventMask)mask
                                    handler:(NSEvent* (^)(NSEvent*))block;
 + (void)removeMonitor:(id)eventMonitor;
 @end
 
-@interface NSScreen (LionAPI)
-- (CGFloat)backingScaleFactor;
-@end
-
 @interface NSWindow (LionAPI)
 - (CGFloat)backingScaleFactor;
 @end
 
 @interface NSView (NSOpenGLSurfaceResolutionLionAPI)
 - (void)setWantsBestResolutionOpenGLSurface:(BOOL)flag;
 @end
 
 static NSString* const NSWindowDidChangeBackingPropertiesNotification =
     @"NSWindowDidChangeBackingPropertiesNotification";
@@ skipping 12 matching lines @@
 static inline int ToWebKitModifiers(NSUInteger flags) {
   int modifiers = 0;
   if (flags & NSControlKeyMask) modifiers |= WebInputEvent::ControlKey;
   if (flags & NSShiftKeyMask) modifiers |= WebInputEvent::ShiftKey;
   if (flags & NSAlternateKeyMask) modifiers |= WebInputEvent::AltKey;
   if (flags & NSCommandKeyMask) modifiers |= WebInputEvent::MetaKey;
   return modifiers;
 }
 
 static float ScaleFactor(NSView* view) {
-  if (NSWindow* window = [view window]) {
-    if ([window respondsToSelector:@selector(backingScaleFactor)])
-      return [window backingScaleFactor];
-    return [window userSpaceScaleFactor];
-  }
-  if (NSScreen* screen = [NSScreen mainScreen]) {
-    if ([screen respondsToSelector:@selector(backingScaleFactor)])
-      return [screen backingScaleFactor];
-    return [screen userSpaceScaleFactor];
-  }
-  return 1;
+  return ui::GetScaleFactorScale(ui::GetScaleFactorForNativeView(view));
 }
 
 // Private methods:
 @interface RenderWidgetHostViewCocoa ()
 @property(nonatomic, assign) NSRange selectedRange;
 @property(nonatomic, assign) NSRange markedRange;
 
 + (BOOL)shouldAutohideCursorForEvent:(NSEvent*)event;
 - (id)initWithRenderWidgetHostViewMac:(RenderWidgetHostViewMac*)r;
 - (void)setRWHVDelegate:(NSObject<RenderWidgetHostViewMacDelegate>*)delegate;
@@ skipping 3081 matching lines @@
   if (!string) return NO;
 
   // If the user is currently using an IME, confirm the IME input,
   // and then insert the text from the service, the same as TextEdit and Safari.
   [self confirmComposition];
   [self insertText:string];
   return YES;
 }
 
 @end