Migrates battery_status from content/renderer/ to WebKit/platform/

third_party/WebKit/Source/platform/testing/MojoTestHelper.h

 // 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.
 
-#ifndef V8Regex_h
-#define V8Regex_h
+#ifndef MojoTestHelper_h
+#define MojoTestHelper_h
 
+#include "base/message_loop/message_loop.h"
 #include "wtf/Noncopyable.h"
-#include "wtf/text/WTFString.h"
-#include <v8.h>
 
 namespace blink {
 
-class V8DebuggerImpl;
-
-enum MultilineMode {
-    MultilineDisabled,
-    MultilineEnabled
-};
-
-class V8Regex {
-    USING_FAST_MALLOC(V8Regex);
-    WTF_MAKE_NONCOPYABLE(V8Regex);
+// Provides common utilities to help writing unittests based on Mojo services.
+//
+// Expected usage is:
+//   class YourUnittest : public ::testing::Test {
+//    private:
+//     MojoTestHelper mojo_test_helper_;

[esprehn, 2016/02/18 06:48:13]

This doesn't seem good, it just adds a message loop. Maybe name this
TestMojoMessageLoop?

This isn't a Helper (and that name doesn't add value).

[Yuki, 2016/02/18 07:20:35]

Then, we're going to introduce this header file just in order to avoid putting a
line of "+base/message_loop" in platform/battery/DEPS, right?

In that way, we don't need TestMojoMessageLoop, we can use base::MessageLoop and
that's what we want.

platform/testing/DEPS:
  "+base/message_loop"  # already exists
platform/testing/MessageLoopForMojo.h:
  #include "base/message_loop/message_loop.h"

platform/battery/battery_dispatcher_proxy_unittest.cc:
  #include "platform/testing/MessageLoopForMojo.h"
  class BatteryDispatcherProxyTest : publi testing::Test {
   private:
    base::MessageLoop message_loop_;  // Why don't we directly use
base::MesssageLoop instead of TestMojoMessageLoop?
  };

Does this look okay?  Or do you really want TestMojoMessageLoop like following?

platform/testing/TestMojoMessageLoop.h:
  #include "base/message_loop/message_loop.h"
  typedef base::MessageLoop TestMojoMessageLoop;

+//   };
+class MojoTestHelper final {
+    WTF_MAKE_NONCOPYABLE(MojoTestHelper);
 public:
-    V8Regex(V8DebuggerImpl*, const String&, TextCaseSensitivity, MultilineMode = MultilineDisabled);
-    int match(const String&, int startFrom = 0, int* matchLength = 0) const;
-    bool isValid() const { return !m_regex.IsEmpty(); }
+    MojoTestHelper() = default;
+    ~MojoTestHelper() = default;
 
 private:
-    V8DebuggerImpl* m_debugger;
-    v8::Global<v8::RegExp> m_regex;
+    base::MessageLoop m_messageLoop; // Mojo needs a message loop running.
 };
 
 } // namespace blink
 
-#endif // V8Regex_h
+#endif // MojoTestHelper_h