Activate a TextInputManager test on Mac OSX.

chrome/browser/renderer_host/site_per_process_text_input_browsertest.cc

 // Copyright 2016 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 <vector>
 
 #include "base/command_line.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
@@ skipping 672 matching lines @@
   for (size_t i = 0; i < views.size(); ++i) {
     // First focus the <input>.
     send_tab_and_wait_for_value(values[i]);
 
     // Send a sequence of |count| 'E' keys and wait until the view receives a
     // selection change update for a text of the corresponding size, |count|.
     send_keys_select_all_wait_for_selection_change(views[i], count++);
   }
 }
 
-// TODO(ekaramad): Enable the following tests on other platforms when the
-// corresponding feature is implemented (http://crbug.com/578168).
-#if defined(USE_AURA)
 // The following test verifies that when the active widget changes value, it is
 // always from nullptr to non-null or vice versa.
 IN_PROC_BROWSER_TEST_F(SitePerProcessTextInputManagerTest,
                        ResetTextInputStateOnActiveWidgetChange) {
   CreateIframePage("a(b,c(a,b),d)");
   std::vector<content::RenderFrameHost*> frames{
       GetFrame(IndexVector{}),     GetFrame(IndexVector{0}),
       GetFrame(IndexVector{1}),    GetFrame(IndexVector{1, 0}),
       GetFrame(IndexVector{1, 1}), GetFrame(IndexVector{2})};
   std::vector<content::RenderWidgetHostView*> views;
@@ skipping 31 matching lines @@
         recorder.active_views()->at(i + 1U);
     EXPECT_TRUE((current != nullptr && next == nullptr) ||
                 (current == nullptr && next != nullptr));
   }
 }
 
 // TODO(ekaramad): The following tests are specifically written for Aura and are
 // based on InputMethodObserver. Write similar tests for Mac/Android/Mus
 // (crbug.com/602723).
 
+#if defined(USE_AURA)
 // -----------------------------------------------------------------------------
 // Input Method Observer Tests
 //
 // The following tests will make use of the InputMethodObserver to verify that
 // OOPIF pages interact properly with the InputMethod through the tab's view.
 
 // TODO(ekaramad): We only have coverage for some aura tests as the whole idea
 // of ui::TextInputClient/ui::InputMethod/ui::InputMethodObserver seems to be
 // only fit to aura (specifically, OS_CHROMEOS). Can we add more tests here for
 // aura as well as other platforms (https://crbug.com/602723)?
@@ skipping 97 matching lines @@
 
   // Set |TextInputState.show_ime_if_needed|. Expect IME.
   sender.SetShowImeIfNeeded(true);
   EXPECT_TRUE(send_and_check_show_ime());
 
   // Set |TextInputState.type| to ui::TEXT_INPUT_TYPE_NONE. Expect no IME.
   sender.SetType(ui::TEXT_INPUT_TYPE_NONE);
   EXPECT_FALSE(send_and_check_show_ime());
 }
 #endif  // USE_AURA