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..95be7f717f622e7aa951f5474dfb56ab56e54e97 100644
--- a/ui/gl/android/surface_texture.cc
+++ b/ui/gl/android/surface_texture.cc
@@ -26,10 +26,19 @@ bool GlContextMethodsAvailable() {
 
 namespace gfx {
 
-SurfaceTexture::SurfaceTexture(int texture_id) {
+SurfaceTexture* SurfaceTexture::Create(int texture_id) {
+  return new SurfaceTexture(texture_id, false);
+}
+
+SurfaceTexture* SurfaceTexture::CreateSingleBufferMode(int texture_id) {
+  DCHECK(IsSingleBufferModeSupported());
+  return new SurfaceTexture(texture_id, true);
+}
+
+SurfaceTexture::SurfaceTexture(int texture_id, bool single_buffer_mode) {
   JNIEnv* env = base::android::AttachCurrentThread();
-  j_surface_texture_.Reset(
-      Java_SurfaceTexturePlatformWrapper_create(env, texture_id));
+  j_surface_texture_.Reset(Java_SurfaceTexturePlatformWrapper_create(
+      env, texture_id, single_buffer_mode));
 }
 
 SurfaceTexture::~SurfaceTexture() {
@@ -52,6 +61,13 @@ 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 +125,10 @@ ANativeWindow* SurfaceTexture::CreateSurface() {
 }
 
 // static
+bool SurfaceTexture::IsSingleBufferModeSupported() {
+  return base::android::BuildInfo::GetInstance()->sdk_int() >= 19;
+}
+
 bool SurfaceTexture::RegisterSurfaceTexture(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }