Add GetActiveScreen to DisplayInfoProvider

chrome/browser/extensions/api/system_display/system_display_apitest.cc

 // Copyright 2013 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 "chrome/browser/extensions/api/system_display/system_display_api.h"
 
 #include "base/debug/leak_annotations.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/extensions/api/system_display/display_info_provider.h"
 #include "chrome/browser/extensions/extension_apitest.h"
@@ skipping 113 matching lines @@
       const std::string& display_id,
       const api::system_display::DisplayProperties& params,
       std::string* error) OVERRIDE {
     // Should get called only once per test case.
     EXPECT_FALSE(set_info_value_);
     set_info_value_ = params.ToValue();
     set_info_display_id_ = display_id;
     return true;
   }
 
+  virtual gfx::Screen* GetActiveScreen() OVERRIDE { return NULL; }
+
   scoped_ptr<base::DictionaryValue> GetSetInfoValue() {
     return set_info_value_.Pass();
   }
 
   std::string GetSetInfoDisplayId() const {
     return set_info_display_id_;
   }
 
  private:
   // Update the content of the |unit| obtained for |display| using
@@ skipping 154 matching lines @@
   EXPECT_EQ(1, utils::GetInteger(overscan, "left"));
   EXPECT_EQ(2, utils::GetInteger(overscan, "top"));
   EXPECT_EQ(3, utils::GetInteger(overscan, "right"));
   EXPECT_EQ(4, utils::GetInteger(overscan, "bottom"));
 
   EXPECT_EQ("display_id", provider_->GetSetInfoDisplayId());
 }
 #endif  // defined(OS_CHROMEOS)
 
 }  // namespace extensions