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

ui/android/java/src/org/chromium/ui/gl/SurfaceTexturePlatformWrapper.java

Index: ui/android/java/src/org/chromium/ui/gl/SurfaceTexturePlatformWrapper.java
diff --git a/ui/android/java/src/org/chromium/ui/gl/SurfaceTexturePlatformWrapper.java b/ui/android/java/src/org/chromium/ui/gl/SurfaceTexturePlatformWrapper.java
index 53d33036edebd785726c59dd42110a40fa6b1610..6e5d51c6962e8143ca0e4bc94b18720b02bc4fee 100644
--- a/ui/android/java/src/org/chromium/ui/gl/SurfaceTexturePlatformWrapper.java
+++ b/ui/android/java/src/org/chromium/ui/gl/SurfaceTexturePlatformWrapper.java
@@ -21,8 +21,8 @@ class SurfaceTexturePlatformWrapper {
     private static final String TAG = "SurfaceTexturePlatformWrapper";
 
     @CalledByNative
-    private static SurfaceTexture create(int textureId) {
-        return new SurfaceTexture(textureId);
+    private static SurfaceTexture create(int textureId, boolean singleBufferMode) {
+        return new SurfaceTexture(textureId, singleBufferMode);

[reveman, 2014/03/10 16:16:58]

you'll need to add a createSingleBuffered as this doesn't work unless
"Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT"

[epennerAtGoogle, 2014/03/10 18:54:07]

Would something like this work? Unless we want more explicit names in java also.
In that case we should have two functions.

if (singleBufferMode) {
  assert(Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT);
  return new SurfaceTexture(textureId, true);
} else {
  return new SurfaceTexture(textureId);
}

[reveman, 2014/03/10 19:02:14]

It would work but I prefer if we only branch once and it happens when the client
checks the value of IsSingleBufferModeSupported(). It's a bit ugly to have an
"if (singleBufferMode)" statement in the java code when we've already done "if
(IsSingleBufferModeSupported())" in the c++ world IMO.

     }
 
     @CalledByNative
@@ -48,6 +48,12 @@ class SurfaceTexturePlatformWrapper {
     }
 
     @CalledByNative
+    private static void releaseTexImage(SurfaceTexture surfaceTexture) {
+        assert Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
+        surfaceTexture.releaseTexImage();
+    }
+
+    @CalledByNative
     private static void setDefaultBufferSize(SurfaceTexture surfaceTexture, int width,
             int height) {
         surfaceTexture.setDefaultBufferSize(width, height);