Upstream VariationsSession

chrome/browser/android/metrics/variations_session.cc

Index: chrome/browser/android/metrics/variations_session.cc
diff --git a/chrome/browser/android/metrics/variations_session.cc b/chrome/browser/android/metrics/variations_session.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b9cac1e50efa9a5cf14959af9231b2da3fef3a1e
--- /dev/null
+++ b/chrome/browser/android/metrics/variations_session.cc
@@ -0,0 +1,46 @@
+// 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 "chrome/browser/android/metrics/variations_session.h"
+
+#include "base/android/jni_string.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/metrics/variations/variations_service.h"
+#include "jni/VariationsSession_jni.h"
+
+namespace {
+
+// Tracks whether VariationsService::OnAppEnterForeground() has been called
+// previously, in order to set the restrict mode param before the first call.
+bool g_on_app_enter_foreground_called = false;
+
+}  // namespace
+
+static void StartVariationsSession(JNIEnv* env,
+                                   jobject obj,
+                                   jstring jrestrict_mode) {
+  DCHECK(g_browser_process);
+
+  chrome_variations::VariationsService* variations_service =
+      g_browser_process->variations_service();
+  // Triggers an OnAppEnterForeground on the VariationsService. This may fetch
+  // a new seed.
+  if (variations_service) {
+    std::string restrict_mode =
+        base::android::ConvertJavaStringToUTF8(env, jrestrict_mode);
+    if (!restrict_mode.empty() && !g_on_app_enter_foreground_called)
+      variations_service->SetRestrictMode(restrict_mode);
+    variations_service->OnAppEnterForeground();
+    g_on_app_enter_foreground_called = true;
+  }
+}
+
+namespace chrome {
+namespace android {
+
+// Register native methods
+bool RegisterVariationsSession(JNIEnv* env) { return RegisterNativesImpl(env); }
+
+}  // namespace android
+}  // namespace chrome