upstream SurfaceTextureListener and SurfaceTextureBridge class for android

content/common/android/surface_texture_listener.cc

Index: content/common/android/surface_texture_listener.cc
diff --git a/content/common/android/surface_texture_listener.cc b/content/common/android/surface_texture_listener.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1d50a142ef5919a1dfe42263a699d85d150308bd
--- /dev/null
+++ b/content/common/android/surface_texture_listener.cc
@@ -0,0 +1,52 @@
+// Copyright (c) 2012 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 "content/common/android/surface_texture_listener.h"
+
+#include "base/location.h"
+#include "base/logging.h"
+#include "base/message_loop_proxy.h"
+#include "content/common/android/surface_texture_bridge.h"
+#include "jni/surface_texture_listener_jni.h"
+
+namespace content {
+
+// static
+jobject SurfaceTextureListener::CreateSurfaceTextureListener(
+    JNIEnv* env,
+    const base::Closure& callback) {
+  // The java listener object owns and releases the native instance.
+  // This is necessary to avoid races with incoming notifications.
+  ScopedJavaLocalRef<jobject> listener(Java_SurfaceTextureListener_create(env,
+      reinterpret_cast<int>(new SurfaceTextureListener(callback))));
+
+  DCHECK(!listener.is_null());
+  return listener.Release();
+}
+
+SurfaceTextureListener::SurfaceTextureListener(const base::Closure& callback)
+    : callback_(callback),
+      browser_loop_(base::MessageLoopProxy::current()) {
+}
+
+SurfaceTextureListener::~SurfaceTextureListener() {
+}
+
+void SurfaceTextureListener::Destroy(JNIEnv* env, jobject obj) {
+  delete this;
+}
+
+void SurfaceTextureListener::FrameAvailable(JNIEnv* env, jobject obj) {
+  // These notifications should be coming in on a thread private to Java.
+  // Should this ever change, we can try to avoid reposting to the same thread.
+  DCHECK(!browser_loop_->BelongsToCurrentThread());
+  browser_loop_->PostTask(FROM_HERE, callback_);
+}
+
+// static
+bool SurfaceTextureListener::RegisterSurfaceTextureListener(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+}  // namespace content