Make Interaction Media Features MQ dynamic on Windows.

content/browser/renderer_host/input/interaction_mq_dynamic_browsertest.cc

+// Copyright 2017 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/macros.h"
+#include "base/strings/utf_string_conversions.h"
+#include "content/browser/renderer_host/render_view_host_impl.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/test/browser_test_utils.h"
+#include "content/public/test/content_browser_test.h"
+#include "content/public/test/content_browser_test_utils.h"
+#include "content/public/test/test_utils.h"
+#include "content/shell/browser/shell.h"
+#include "ui/base/touch/touch_device.h"
+
+namespace content {
+
+namespace {
+
+class InteractionMediaQueriesDynamicTest : public ContentBrowserTest {
+ public:
+  InteractionMediaQueriesDynamicTest() = default;
+  ~InteractionMediaQueriesDynamicTest() override = default;
+};
+
+}  //  namespace
+
+#if defined(OS_WIN)
+IN_PROC_BROWSER_TEST_F(InteractionMediaQueriesDynamicTest,
+                       PointerMediaQueriesDynamic) {
+  GURL test_url = GetTestUrl("", "interaction-mq-dynamic.html");
+  const base::string16 kSuccessTitle(base::ASCIIToUTF16("SUCCESS"));
+  TitleWatcher title_watcher(shell()->web_contents(), kSuccessTitle);
+  NavigateToURL(shell(), test_url);
+  RenderViewHost* rvh = shell()->web_contents()->GetRenderViewHost();
+  ui::SetAvailablePointerAndHoverTypesForTesting(ui::POINTER_TYPE_COARSE,
+                                                 ui::HOVER_TYPE_HOVER);
+  rvh->OnWebkitPreferencesChanged();

[jam, 2017/04/10 15:01:06]

why do you need to call this? I thought the observer will do this?

+  EXPECT_EQ(kSuccessTitle, title_watcher.WaitAndGetTitle());
+}
+#endif
+
+}  //  namespace content