Chromecast: adds CastMetricsHelper API from Java.

R=byungchul@chromium.org,lcwu@chromium.org
BUG=internal b/21262248

Review URL: https://codereview.chromium.org/1134183004

Cr-Commit-Position: refs/heads/master@{#330556}

chromecast/android/cast_jni_registrar.cc

@@ -6,6 +6,7 @@
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_registrar.h"
+#include "chromecast/android/cast_metrics_helper_android.h"
 #include "chromecast/browser/android/cast_window_android.h"
 #include "chromecast/browser/android/cast_window_manager.h"
 #include "chromecast/crash/android/crash_handler.h"
@@ -17,6 +18,7 @@ namespace android {
 namespace {
 
 static base::android::RegistrationMethod kMethods[] = {
+  { "CastMetricsHelperAndroid", CastMetricsHelperAndroid::RegisterJni },
   { "CastWindowAndroid", shell::CastWindowAndroid::RegisterJni },
   { "CastWindowManager", shell::RegisterCastWindowManager },
   { "CrashHandler", CrashHandler::RegisterCastCrashJni },

chromecast/android/cast_metrics_helper_android.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 "chromecast/android/cast_metrics_helper_android.h"
+
+#include "chromecast/base/metrics/cast_metrics_helper.h"
+#include "jni/CastMetricsHelper_jni.h"
+
+namespace chromecast {
+
+// static
+bool CastMetricsHelperAndroid::RegisterJni(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+void LogMediaPlay(JNIEnv* env, jclass clazz) {
+  metrics::CastMetricsHelper::GetInstance()->LogMediaPlay();
+}
+
+void LogMediaPause(JNIEnv* env, jclass clazz) {
+  metrics::CastMetricsHelper::GetInstance()->LogMediaPause();
+}
+
+}  // namespace chromecast

chromecast/android/cast_metrics_helper_android.h

+// 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.
+
+#ifndef CHROMECAST_ANDROID_CAST_METRICS_HELPER_ANDROID_H_
+#define CHROMECAST_ANDROID_CAST_METRICS_HELPER_ANDROID_H_
+
+#include <jni.h>
+#include <vector>
+
+#include "base/macros.h"
+
+namespace chromecast {
+
+class CastMetricsHelperAndroid {
+ public:
+  // Registers the JNI methods for CastMetricsHelperAndroid.
+  static bool RegisterJni(JNIEnv* env);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(CastMetricsHelperAndroid);
+};
+
+}  // namespace chromecast
+
+#endif  // CHROMECAST_ANDROID_CAST_METRICS_HELPER_ANDROID_H_

chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastMetricsHelper.java

+// 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.
+
+package org.chromium.chromecast.shell;
+
+import org.chromium.base.JNINamespace;
+
+/**
+ * Wrapper of native CastMetricsHelper.
+ */
+@JNINamespace("chromecast")
+public final class CastMetricsHelper {
+
+    public static void logMediaPlay() {
+        nativeLogMediaPlay();
+    }
+    private static native void nativeLogMediaPlay();
+
+    public static void logMediaPause() {
+        nativeLogMediaPause();
+    }
+    private static native void nativeLogMediaPause();
+
+}

chromecast/chromecast.gyp

@@ -448,6 +448,8 @@
           'sources': [
             'android/cast_jni_registrar.cc',
             'android/cast_jni_registrar.h',
+            'android/cast_metrics_helper_android.cc',
+            'android/cast_metrics_helper_android.h',
             'android/chromecast_config_android.cc',
             'android/chromecast_config_android.h',
             'android/platform_jni_loader.h',
@@ -532,6 +534,7 @@
           'type': 'none',
           'sources': [
             'browser/android/apk/src/org/chromium/chromecast/shell/CastCrashHandler.java',
+            'browser/android/apk/src/org/chromium/chromecast/shell/CastMetricsHelper.java',
             'browser/android/apk/src/org/chromium/chromecast/shell/CastWindowAndroid.java',
             'browser/android/apk/src/org/chromium/chromecast/shell/CastWindowManager.java',
           ],