DO NOT COMMIT - DialogSurface initial implementation.

media/base/android/dialog_surface_controller.h

+// Copyright 2016 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 MEDIA_BASE_ANDROID_DIALOG_SURFACE_CONTROLLER_H_
+#define MEDIA_BASE_ANDROID_DIALOG_SURFACE_CONTROLLER_H_
+
+#include <jni.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#include <set>
+#include <string>
+
+#include "base/android/scoped_java_ref.h"
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/task_runner.h"
+#include "base/threading/thread_checker.h"
+#include "base/time/time.h"
+#include "media/base/media_export.h"
+#include "ui/gfx/geometry/point.h"
+#include "ui/gfx/geometry/size.h"
+#include "ui/gl/android/scoped_java_surface.h"
+
+namespace base {
+class WaitableEvent;
+}
+
+namespace media {
+
+class DialogSurfaceCallback;
+class DialogSurfaceManager;
+
+// This class implements the C++ wrapper around a java DialogSurfaceController.
+// All callbacks happen on the thread that it's constructed on.
+class MEDIA_EXPORT DialogSurfaceController {
+ public:
+  // These must match DialogSurfaceController.java
+  enum CallbackOp { SURFACE_CREATED = 0, SURFACE_DESTROYED = 1 };
+
+  // Callback type for finding out about the status of the surface.  While we
+  // don't use this directly, it lets us keep DialogSurfaceCallback as an
+  // implementation detail.
+  using Callback = base::Callback<void(CallbackOp)>;
+
+  // Configuration for the surface.
+  struct Config {
+    gfx::Point position;
+    gfx::Size size;
+    // This may also include pixel format, is_secure, etc.
+  };
+
+  // |unwrapped_controller| is the IDialogSurfaceController java instance, which
+  // we will take ownership of.  |callback| is the wrapped callback that it will
+  // use to communicate with us (DialogSurfaceCallback).
+  // Note: one generally doesn't want to call this directly.  Use
+  // DialogSurfaceManager instead.
+  DialogSurfaceController(
+      const base::android::JavaRef<jobject>& unwrapped_controller,
+      std::unique_ptr<DialogSurfaceCallback>&& callback);
+  ~DialogSurfaceController();
+
+  // Schedule a relayout and/or reposition of the surface.
+  void ScheduleLayout(const Config& config);
+
+  // Return the java surface, if any.  One should not assume that this is
+  // available immediately.  The callback will be called with SURFACE_CREATED
+  // when it is available.  Of course, it may become unavailable again
+  // asynchronously, so one must always check.
+  gl::ScopedJavaSurface GetSurface();
+
+  static bool RegisterDialogSurfaceController(JNIEnv* env);
+
+ protected:
+  bool CalledOnValidThread() const;
+
+ private:
+  // Java DialogSurfaceControllerWrapper instance.
+  base::android::ScopedJavaGlobalRef<jobject> j_wrapped_controller_;
+
+  // Callback that's associated with this surface.  We maintain ownership of it
+  // so that the native object stays around while we do.
+  std::unique_ptr<DialogSurfaceCallback> wrapped_callback_;
+
+  base::ThreadChecker thread_checker_;
+
+  DISALLOW_COPY_AND_ASSIGN(DialogSurfaceController);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_ANDROID_DIALOG_SURFACE_CONTROLLER_H_