[Android] Upstream scene layers

chrome/browser/android/compositor/scene_layer/scene_layer.cc

+// 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/compositor/scene_layer/scene_layer.h"
+
+#include "cc/layers/layer.h"
+#include "jni/SceneLayer_jni.h"
+
+namespace chrome {
+namespace android {
+
+// static
+SceneLayer* SceneLayer::FromJavaObject(JNIEnv* env, jobject jobj) {
+  if (jobj == nullptr)
+    return nullptr;
+  return reinterpret_cast<SceneLayer*>(Java_SceneLayer_getNativePtr(env, jobj));
+}
+
+SceneLayer::SceneLayer(JNIEnv* env, jobject jobj)
+    : SceneLayer(env, jobj, cc::Layer::Create()) {
+}
+
+SceneLayer::SceneLayer(JNIEnv* env,
+                       jobject jobj,
+                       scoped_refptr<cc::Layer> layer)
+    : weak_java_scene_layer_(env, jobj), layer_(layer) {
+  Java_SceneLayer_setNativePtr(env, jobj, reinterpret_cast<intptr_t>(this));
+}
+
+SceneLayer::~SceneLayer() {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> jobj = weak_java_scene_layer_.get(env);
+  if (jobj.is_null())
+    return;
+
+  Java_SceneLayer_setNativePtr(
+      env, jobj.obj(),
+      reinterpret_cast<intptr_t>(static_cast<SceneLayer*>(NULL)));
+}
+
+void SceneLayer::OnDetach() {
+  layer()->RemoveFromParent();
+}
+
+void SceneLayer::Destroy(JNIEnv* env, jobject jobj) {
+  delete this;
+}
+
+bool SceneLayer::ShouldShowBackground() {
+  return false;
+}
+
+SkColor SceneLayer::GetBackgroundColor() {
+  return SK_ColorWHITE;
+}
+
+static jlong Init(JNIEnv* env, jobject jobj) {
+  // This will automatically bind to the Java object and pass ownership there.
+  SceneLayer* tree_provider = new SceneLayer(env, jobj);
+  return reinterpret_cast<intptr_t>(tree_provider);
+}
+
+bool RegisterSceneLayer(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+}  // namespace android
+}  // namespace chrome