Fix automation API bounding boxes on high-dpi devices

chrome/renderer/extensions/automation_internal_custom_bindings.h

 // 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.
 
 #ifndef CHROME_RENDERER_EXTENSIONS_AUTOMATION_INTERNAL_CUSTOM_BINDINGS_H_
 #define CHROME_RENDERER_EXTENSIONS_AUTOMATION_INTERNAL_CUSTOM_BINDINGS_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "chrome/common/extensions/api/automation.h"
@@ skipping 41 matching lines @@
   void OnMessageReceived(const IPC::Message& message);
 
   TreeCache* GetTreeCacheFromTreeID(int tree_id);
 
   ui::AXNode* GetParent(ui::AXNode* node, TreeCache** in_out_cache);
 
   ScriptContext* context() const {
     return ObjectBackedNativeHandler::context();
   }
 
+  float GetDeviceScaleFactor() const;
+
  private:
   // ObjectBackedNativeHandler overrides:
   void Invalidate() override;
 
   // Returns whether this extension has the "interact" permission set (either
   // explicitly or implicitly after manifest parsing).
   void IsInteractPermitted(const v8::FunctionCallbackInfo<v8::Value>& args);
 
   // Returns an object with bindings that will be added to the
   // chrome.automation namespace.
@@ skipping 113 matching lines @@
   std::vector<int> text_changed_node_ids_;
   ExtensionBindingsSystem* bindings_system_;
   bool should_ignore_context_;
 
   DISALLOW_COPY_AND_ASSIGN(AutomationInternalCustomBindings);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_RENDERER_EXTENSIONS_AUTOMATION_INTERNAL_CUSTOM_BINDINGS_H_