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

chrome/browser/android/service_tab_creator.h

Index: chrome/browser/android/service_tab_creator.h
diff --git a/chrome/browser/android/service_tab_creator.h b/chrome/browser/android/service_tab_creator.h
new file mode 100644
index 0000000000000000000000000000000000000000..b7da9d090417f356ecbce40467a8cc83d47cd902
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+++ b/chrome/browser/android/service_tab_creator.h
@@ -0,0 +1,46 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.

[Miguel Garcia, 2015/02/03 16:58:40]

There is already an intentHelper c++/java that does similar things, perhaps it's
worth combining them. Up to you.

[Peter Beverloo, 2015/02/03 17:24:54]

Nah, because this class will need to keep request Ids as well - it'll get some
more logic in patch 2.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_ANDROID_SERVICE_TAB_CREATOR_H_
+#define CHROME_BROWSER_ANDROID_SERVICE_TAB_CREATOR_H_
+
+#include "base/android/jni_android.h"
+#include "base/callback_forward.h"
+#include "base/memory/singleton.h"
+
+namespace content {
+class BrowserContext;
+struct OpenURLParams;
+class WebContents;
+}
+

[Miguel Garcia, 2015/02/03 16:58:40]

namespace it? 

[Peter Beverloo, 2015/02/03 17:24:54]

Done. "namespace chrome {}" eeuw :-(

+// Class for creating new tabs on Android from a background service, where there
+// may not necessarily be an Activity or a tab model at all. The creator is
+// able to report back to the user when the tab has been created.

[Miguel Garcia, 2015/02/03 16:58:40]

same thing, we are not quite able to report back yet so let's keep the comments
in par with the implementation?

[Peter Beverloo, 2015/02/03 17:24:54]

Done.

+class ServiceTabCreator {
+ public:
+  // Returns the singleton instance of the service tab creator.
+  static ServiceTabCreator* GetInstance();
+
+  // Creates a new tab when we're in an Android Service rather than an Activity.
+  // |callback| will be invoked with the resulting content::WebContents* when
+  // the tab is avialable. This method must only be called from the UI thread.
+  void CreateTab(content::BrowserContext* browser_context,
+                 const content::OpenURLParams& params,
+                 base::Callback<void(content::WebContents*)> callback);
+
+  static bool RegisterServiceTabCreator(JNIEnv* env);
+
+ private:
+  friend struct DefaultSingletonTraits<ServiceTabCreator>;
+
+  ServiceTabCreator();
+  ~ServiceTabCreator();
+
+  base::android::ScopedJavaGlobalRef<jobject> java_object_;
+
+  DISALLOW_COPY_AND_ASSIGN(ServiceTabCreator);
+};
+
+#endif  // CHROME_BROWSER_ANDROID_SERVICE_TAB_CREATOR_H_