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

content/browser/devtools/protocol/color_picker.cc

 // Copyright 2014 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/devtools/protocol/color_picker.h"
 
 #include "base/bind.h"
 #include "build/build_config.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
@@ skipping 148 matching lines @@
   const float kPixelSize = 9;
 #else
   const float kCursorSize = 150;
   const float kDiameter = 110;
   const float kHotspotOffset = 25;
   const float kHotspotRadius = 5;
   const float kPixelSize = 10;
 #endif
 
   blink::WebScreenInfo screen_info;
-  view->GetScreenInfo(&screen_info);
+  host_->GetWebScreenInfo(&screen_info);
   double device_scale_factor = screen_info.deviceScaleFactor;
 
   SkBitmap result;
   result.allocN32Pixels(kCursorSize * device_scale_factor,
                         kCursorSize * device_scale_factor);
   result.eraseARGB(0, 0, 0, 0);
 
   SkCanvas canvas(result);
   canvas.scale(device_scale_factor, device_scale_factor);
   canvas.translate(0.5f, 0.5f);
@@ skipping 75 matching lines @@
                  kHotspotOffset * device_scale_factor);
 
   cursor.InitFromCursorInfo(cursor_info);
   DCHECK(host_);
   host_->SetCursor(cursor);
 }
 
 }  // namespace page
 }  // namespace devtools
 }  // namespace content