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

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"
 
 #import <objc/runtime.h>
 #include <OpenGL/gl.h>
 #include <QuartzCore/QuartzCore.h>
 #include <stdint.h>
@@ skipping 358 matching lines @@
   // case from extension popup windows.
   NSWindow* ancestor_window = [enclosing_window parentWindow];
   if (ancestor_window && (NSWidth([enclosing_window frame]) ==
                           NSWidth([ancestor_window frame]))) {
     enclosing_window = ancestor_window;
   }
 
   return enclosing_window;
 }
 
-blink::WebScreenInfo GetWebScreenInfo(NSView* view) {
-  display::Display display =
-      display::Screen::GetScreen()->GetDisplayNearestWindow(view);
-
-  NSScreen* screen = [NSScreen deepestScreen];
-
-  blink::WebScreenInfo results;
-
-  results.deviceScaleFactor = static_cast<int>(display.device_scale_factor());
-  results.depth = NSBitsPerPixelFromDepth([screen depth]);
-  results.depthPerComponent = NSBitsPerSampleFromDepth([screen depth]);
-  results.isMonochrome =
-      [[screen colorSpace] colorSpaceModel] == NSGrayColorSpaceModel;
-  results.rect = display.bounds();
-  results.availableRect = display.work_area();
-  results.orientationAngle = display.RotationAsDegree();
-  results.orientationType =
-      content::RenderWidgetHostViewBase::GetOrientationTypeForDesktop(display);
-
-  return results;
-}
-
 }  // namespace
 
 namespace content {
 
 ////////////////////////////////////////////////////////////////////////////////
 // BrowserCompositorMacClient, public:
 
 NSView* RenderWidgetHostViewMac::BrowserCompositorMacGetNSView() const {
   return cocoa_view_;
 }
@@ skipping 51 matching lines @@
   *timebase = base::TimeTicks();
   *interval = base::TimeDelta();
 }
 
 void RenderWidgetHostViewMac::AcceleratedWidgetSwapCompleted() {
   if (display_link_)
     display_link_->NotifyCurrentTime(base::TimeTicks::Now());
 }
 
 ///////////////////////////////////////////////////////////////////////////////
-// RenderWidgetHostViewBase, public:
-
-// static
-void RenderWidgetHostViewBase::GetDefaultScreenInfo(
-    blink::WebScreenInfo* results) {
-  *results = GetWebScreenInfo(NULL);
-}
-
-///////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewMac, public:
 
 RenderWidgetHostViewMac::RenderWidgetHostViewMac(RenderWidgetHost* widget,
                                                  bool is_guest_view_hack)
     : render_widget_host_(RenderWidgetHostImpl::From(widget)),
       page_at_minimum_scale_(true),
       is_loading_(false),
       allow_pause_for_resize_or_repaint_(true),
       is_guest_view_hack_(is_guest_view_hack),
       fullscreen_parent_host_view_(nullptr),
@@ skipping 836 matching lines @@
     DLOG(ERROR) << "Received unexpected frame type.";
     bad_message::ReceivedBadMessage(render_widget_host_->GetProcess(),
                                     bad_message::RWHVM_UNEXPECTED_FRAME_TYPE);
   }
 }
 
 void RenderWidgetHostViewMac::ClearCompositorFrame() {
   browser_compositor_->GetDelegatedFrameHost()->ClearDelegatedFrame();
 }
 
-void RenderWidgetHostViewMac::GetScreenInfo(blink::WebScreenInfo* results) {
-  *results = GetWebScreenInfo(GetNativeView());
-}
-
 gfx::Rect RenderWidgetHostViewMac::GetBoundsInRootWindow() {
   // TODO(shess): In case of !window, the view has been removed from
   // the view hierarchy because the tab isn't main.  Could retrieve
   // the information from the main tab for our window.
   NSWindow* enclosing_window = ApparentWindowForView(cocoa_view_);
   if (!enclosing_window)
     return gfx::Rect();
 
   NSRect bounds = [enclosing_window frame];
   return FlipNSRectToRectScreen(bounds);
@@ skipping 251 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 // display::DisplayObserver, public:
 
 void RenderWidgetHostViewMac::OnDisplayAdded(const display::Display& display) {}
 
 void RenderWidgetHostViewMac::OnDisplayRemoved(
     const display::Display& display) {}
 
 void RenderWidgetHostViewMac::OnDisplayMetricsChanged(
     const display::Display& display,
-    uint32_t metrics) {
+    uint32_t changed_metrics) {
   display::Screen* screen = display::Screen::GetScreen();
   if (display.id() != screen->GetDisplayNearestWindow(cocoa_view_).id())
     return;
 
+  if (changed_metrics & DisplayObserver::DISPLAY_METRIC_DEVICE_SCALE_FACTOR) {
+    RenderWidgetHostImpl* host =
+        RenderWidgetHostImpl::From(GetRenderWidgetHost());
+    if (host && host->delegate())
+      host->delegate()->UpdateDeviceScaleFactor(display.device_scale_factor());
+  }
+
   UpdateScreenInfo(cocoa_view_);
 }
 
 }  // namespace content
 
 // RenderWidgetHostViewCocoa ---------------------------------------------------
 
 @implementation RenderWidgetHostViewCocoa
 @synthesize selectedRange = selectedRange_;
 @synthesize suppressNextEscapeKeyUp = suppressNextEscapeKeyUp_;
@@ skipping 1628 matching lines @@
 
 // "-webkit-app-region: drag | no-drag" is implemented on Mac by excluding
 // regions that are not draggable. (See ControlRegionView in
 // native_app_window_cocoa.mm). This requires the render host view to be
 // draggable by default.
 - (BOOL)mouseDownCanMoveWindow {
   return YES;
 }
 
 @end