[chrome.displaySource] Add WiFi Display session class skeleton and mojo service

extensions/browser/api/display_source/display_source_apitest.cc

 // Copyright 2015 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 "base/memory/scoped_ptr.h"
 #include "content/public/test/test_utils.h"
 #include "extensions/browser/api/display_source/display_source_connection_delegate.h"
 #include "extensions/browser/api/display_source/display_source_connection_delegate_factory.h"
 #include "extensions/shell/test/shell_apitest.h"
 
@@ skipping 33 matching lines @@
   void RequestAuthentication(int sink_id,
                              const AuthInfoCallback& auth_info_callback,
                              const FailureCallback& failure_callback) override {
     DisplaySourceAuthInfo info;
     info.method = AUTHENTICATION_METHOD_PBC;
     auth_info_callback.Run(info);
   }
 
   void Connect(int sink_id,
                const DisplaySourceAuthInfo& auth_info,
-               const base::Closure& connected_callback,
                const FailureCallback& failure_callback) override {}
 
-  void Disconnect(const base::Closure& disconnected_callback,
-                  const FailureCallback& failure_callback) override {}
+  void Disconnect(const FailureCallback& failure_callback) override {}
 
-  void StartWatchingSinks() override {
+  void StartWatchingAvailableSinks() override {
     AddSink(CreateSinkInfoPtr(2, "sink 2", SINK_STATE_DISCONNECTED));
   }
 
-  void StopWatchingSinks() override {}
+  void StopWatchingAvailableSinks() override {}
 
  private:
   void AddSink(DisplaySourceSinkInfoPtr sink) {
     sinks_.push_back(sink);
     FOR_EACH_OBSERVER(DisplaySourceConnectionDelegate::Observer, observers_,
                       OnSinksUpdated(sinks_));
   }
 
   DisplaySourceSinkInfoList sinks_;
 };
@@ skipping 15 matching lines @@
         browser_context(), &CreateMockDelegate);
     content::RunAllPendingInMessageLoop();
   }
 };
 
 IN_PROC_BROWSER_TEST_F(DisplaySourceApiTest, DisplaySourceExtension) {
   ASSERT_TRUE(RunAppTest("api_test/display_source/api")) << message_;
 }
 
 }  // namespace extensions