First step in enabling creating tabs without an Activity on Android.

chrome/browser/android/service_tab_launcher.cc

Index: chrome/browser/android/service_tab_launcher.cc
diff --git a/chrome/browser/android/service_tab_launcher.cc b/chrome/browser/android/service_tab_launcher.cc
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+++ b/chrome/browser/android/service_tab_launcher.cc
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+// 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/service_tab_launcher.h"
+
+#include "base/android/jni_string.h"
+#include "base/callback.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/page_navigator.h"
+#include "jni/ServiceTabLauncher_jni.h"
+
+using base::android::AttachCurrentThread;
+using base::android::ConvertUTF8ToJavaString;
+using base::android::GetApplicationContext;
+
+namespace chrome {
+namespace android {
+
+// static
+ServiceTabLauncher* ServiceTabLauncher::GetInstance() {
+  return Singleton<ServiceTabLauncher>::get();
+}
+
+ServiceTabLauncher::ServiceTabLauncher() {
+  java_object_.Reset(
+      Java_ServiceTabLauncher_create(
+          AttachCurrentThread(),
+          reinterpret_cast<intptr_t>(this),
+          GetApplicationContext()));
+}
+
+ServiceTabLauncher::~ServiceTabLauncher() {}
+
+void ServiceTabLauncher::LaunchTab(
+    content::BrowserContext* browser_context,
+    const content::OpenURLParams& params,
+    const base::Callback<void(content::WebContents*)>& callback) {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jstring> url = ConvertUTF8ToJavaString(
+      env, params.url.spec());
+
+  Java_ServiceTabLauncher_launchTab(env,
+                                    java_object_.obj(),
+                                    url.obj(),
+                                    params.disposition,
+                                    browser_context->IsOffTheRecord());
+
+  // TODO(peter): We need to wait for the Android Activity to reply to the
+  // launch intent with the ID of the launched Web Contents, so that the Java
+  // side can invoke a method on the native side with the request id and the
+  // WebContents enabling us to invoke |callback|. See https://crbug.com/454809.
+}
+
+bool ServiceTabLauncher::RegisterServiceTabLauncher(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+}  // namespace android
+}  // namespace chrome