This is initial API support required for enabling SurfaceTexture backed zero-copy for Android

ui/gl/android/surface_texture.cc

Index: ui/gl/android/surface_texture.cc
diff --git a/ui/gl/android/surface_texture.cc b/ui/gl/android/surface_texture.cc
index 35f9b47288b6deb3ac9e865e826bed9edef872a2..a580041f3b73941f2be2798908cf69f534453d42 100644
--- a/ui/gl/android/surface_texture.cc
+++ b/ui/gl/android/surface_texture.cc
@@ -26,12 +26,25 @@ bool GlContextMethodsAvailable() {
 
 namespace gfx {
 
-SurfaceTexture::SurfaceTexture(int texture_id) {
+scoped_refptr<SurfaceTexture> SurfaceTexture::Create(int texture_id) {
   JNIEnv* env = base::android::AttachCurrentThread();
-  j_surface_texture_.Reset(
+  return new SurfaceTexture(
       Java_SurfaceTexturePlatformWrapper_create(env, texture_id));
 }
 
+scoped_refptr<SurfaceTexture> SurfaceTexture::CreateSingleBuffered(
+    int texture_id) {
+  DCHECK(IsSingleBufferModeSupported());
+  JNIEnv* env = base::android::AttachCurrentThread();
+  return new SurfaceTexture(
+      Java_SurfaceTexturePlatformWrapper_createSingleBuffered(env, texture_id));
+}
+
+SurfaceTexture::SurfaceTexture(
+    const base::android::ScopedJavaLocalRef<jobject>& j_surface_texture) {
+  j_surface_texture_.Reset(j_surface_texture);
+}
+
 SurfaceTexture::~SurfaceTexture() {
   JNIEnv* env = base::android::AttachCurrentThread();
   Java_SurfaceTexturePlatformWrapper_destroy(env, j_surface_texture_.obj());
@@ -52,6 +65,13 @@ void SurfaceTexture::UpdateTexImage() {
                                                     j_surface_texture_.obj());
 }
 
+void SurfaceTexture::ReleaseTexImage() {
+  DCHECK(IsSingleBufferModeSupported());
+  JNIEnv* env = base::android::AttachCurrentThread();
+  Java_SurfaceTexturePlatformWrapper_releaseTexImage(env,
+                                                     j_surface_texture_.obj());
+}
+
 void SurfaceTexture::GetTransformMatrix(float mtx[16]) {
   JNIEnv* env = base::android::AttachCurrentThread();
 
@@ -109,6 +129,10 @@ ANativeWindow* SurfaceTexture::CreateSurface() {
 }
 
 // static
+bool SurfaceTexture::IsSingleBufferModeSupported() {
+  return base::android::BuildInfo::GetInstance()->sdk_int() >= 19;
+}
+
 bool SurfaceTexture::RegisterSurfaceTexture(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }