Move app launch metric recording code from NTP to chrome/common.

chrome/common/extensions/extension_metrics.cc

Index: chrome/common/extensions/extension_metrics.cc
diff --git a/chrome/common/extensions/extension_metrics.cc b/chrome/common/extensions/extension_metrics.cc
new file mode 100644
index 0000000000000000000000000000000000000000..eef45a4928c7a1e1fa2210dfaee07282aa31d6b2
--- /dev/null
+++ b/chrome/common/extensions/extension_metrics.cc
@@ -0,0 +1,50 @@
+// 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.
+
+#include "chrome/common/extensions/extension_metrics.h"
+
+#include "base/metrics/histogram.h"
+#include "extensions/common/constants.h"
+#include "extensions/common/extension.h"
+
+namespace extensions {
+
+void RecordAppLaunchType(extension_misc::AppLaunchBucket bucket,
+                         extensions::Manifest::Type app_type) {
+  DCHECK_LT(bucket, extension_misc::APP_LAUNCH_BUCKET_BOUNDARY);
+  if (app_type == extensions::Manifest::TYPE_PLATFORM_APP) {
+    UMA_HISTOGRAM_ENUMERATION("Apps.AppLaunch", bucket,
+                              extension_misc::APP_LAUNCH_BUCKET_BOUNDARY);
+  } else {
+    UMA_HISTOGRAM_ENUMERATION("Extensions.AppLaunch", bucket,
+                              extension_misc::APP_LAUNCH_BUCKET_BOUNDARY);
+  }
+}
+
+void RecordAppListSearchLaunch(const extensions::Extension* extension) {
+  extension_misc::AppLaunchBucket bucket =
+      extension_misc::APP_LAUNCH_APP_LIST_SEARCH;
+  if (extension->id() == extensions::kWebStoreAppId)
+    bucket = extension_misc::APP_LAUNCH_APP_LIST_SEARCH_WEBSTORE;
+  else if (extension->id() == extension_misc::kChromeAppId)
+    bucket = extension_misc::APP_LAUNCH_APP_LIST_SEARCH_CHROME;
+  RecordAppLaunchType(bucket, extension->GetType());
+}
+
+void RecordAppListMainLaunch(const extensions::Extension* extension) {
+  extension_misc::AppLaunchBucket bucket =
+      extension_misc::APP_LAUNCH_APP_LIST_MAIN;
+  if (extension->id() == extensions::kWebStoreAppId)
+    bucket = extension_misc::APP_LAUNCH_APP_LIST_MAIN_WEBSTORE;
+  else if (extension->id() == extension_misc::kChromeAppId)
+    bucket = extension_misc::APP_LAUNCH_APP_LIST_MAIN_CHROME;
+  RecordAppLaunchType(bucket, extension->GetType());
+}
+
+void RecordWebStoreLaunch() {
+  RecordAppLaunchType(extension_misc::APP_LAUNCH_NTP_WEBSTORE,
+                      extensions::Manifest::TYPE_HOSTED_APP);
+}
+
+}  // namespace extensions