Add test_runner API to set the value of an accessibility object.

components/test_runner/web_ax_object_proxy.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 COMPONENTS_TEST_RUNNER_WEB_AX_OBJECT_PROXY_H_
 #define COMPONENTS_TEST_RUNNER_WEB_AX_OBJECT_PROXY_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 115 matching lines @@
   void SetSelectedTextRange(int selection_start, int length);
   bool IsAttributeSettable(const std::string& attribute);
   bool IsPressActionSupported();
   bool IsIncrementActionSupported();
   bool IsDecrementActionSupported();
   v8::Local<v8::Object> ParentElement();
   void Increment();
   void Decrement();
   void ShowMenu();
   void Press();
+  bool SetValue(const std::string& value);
   bool IsEqual(v8::Local<v8::Object> proxy);
   void SetNotificationListener(v8::Local<v8::Function> callback);
   void UnsetNotificationListener();
   void TakeFocus();
   void ScrollToMakeVisible();
   void ScrollToMakeVisibleWithSubFocus(int x, int y, int width, int height);
   void ScrollToGlobalPoint(int x, int y);
   int WordStart(int character_index);
   int WordEnd(int character_index);
   v8::Local<v8::Object> NextOnLine();
@@ skipping 40 matching lines @@
   v8::Local<v8::Object> GetOrCreate(const blink::WebAXObject&) override;
 
  private:
   typedef v8::PersistentValueVector<v8::Object> ElementList;
   ElementList elements_;
 };
 
 }  // namespace test_runner
 
 #endif  // COMPONENTS_TEST_RUNNER_WEB_AX_OBJECT_PROXY_H_