gpu: Optimize and cleanup code used for CHROMIUM_copy_texture.

content/common/gpu/media/android_video_decode_accelerator.cc

Index: content/common/gpu/media/android_video_decode_accelerator.cc
diff --git a/content/common/gpu/media/android_video_decode_accelerator.cc b/content/common/gpu/media/android_video_decode_accelerator.cc
index f72e1b257d77c8bc9f5c243ab2f1e34d5faad042..a9392de8a8b87f2f07ca5d225d490a102f1c55f7 100644
--- a/content/common/gpu/media/android_video_decode_accelerator.cc
+++ b/content/common/gpu/media/android_video_decode_accelerator.cc
@@ -357,10 +357,23 @@ void AndroidVideoDecodeAccelerator::SendCurrentSurfaceToClient(
   //    attached.
   // 2. SurfaceTexture requires us to apply a transform matrix when we show
   //    the texture.
-  copier_->DoCopyTexture(gl_decoder_.get(), GL_TEXTURE_EXTERNAL_OES,
-                         GL_TEXTURE_2D, surface_texture_id_,
-                         picture_buffer_texture_id, 0, size_.width(),
-                         size_.height(), false, false, false);
+  // TODO(hkuang): get the StreamTexture transform matrix in GPU process
+  // instead of using default matrix crbug.com/226218.
+  const static GLfloat default_matrix[16] = {1.0f, 0.0f, 0.0f, 0.0f,
+                                             0.0f, 1.0f, 0.0f, 0.0f,
+                                             0.0f, 0.0f, 1.0f, 0.0f,
+                                             0.0f, 0.0f, 0.0f, 1.0f};
+  copier_->DoCopyTextureWithTransform(gl_decoder_.get(),

[dshwang, 2014/07/10 22:08:22]

I changed here like gles2_cmd_decoder. Could you review here again?
hkuang@, I added TODO same to comment in gles2_cmd_decoder.

+                                      GL_TEXTURE_EXTERNAL_OES,
+                                      surface_texture_id_,
+                                      picture_buffer_texture_id,
+                                      0,
+                                      size_.width(),
+                                      size_.height(),
+                                      false,
+                                      false,
+                                      false,
+                                      default_matrix);
 
   base::MessageLoop::current()->PostTask(
       FROM_HERE,