Relocate SurfaceTexture usage from AVDA GLImage into shared state.

media/gpu/avda_shared_state.cc

Index: media/gpu/avda_shared_state.cc
diff --git a/media/gpu/avda_shared_state.cc b/media/gpu/avda_shared_state.cc
index 12b25256fabf2e4ac2a9c84ec0ef1dcea54730ea..40fd3a04d8b40f0204f44cc18e58ea3677753e3c 100644
--- a/media/gpu/avda_shared_state.cc
+++ b/media/gpu/avda_shared_state.cc
@@ -16,7 +16,14 @@ namespace media {
 AVDASharedState::AVDASharedState()
     : surface_texture_service_id_(0),
       frame_available_event_(base::WaitableEvent::ResetPolicy::AUTOMATIC,
-                             base::WaitableEvent::InitialState::NOT_SIGNALED) {}
+                             base::WaitableEvent::InitialState::NOT_SIGNALED),
+
+      gl_matrix_{
+          1, 0,  0, 0,  // Default to a sane guess of "flip Y", just in case we
+          0, -1, 0, 0,  // can't get the matrix on the first call.
+          0, 0,  1, 0,  //
+          0, 1,  0, 1,  // Comment preserves 4x4 formatting.
+      } {}
 
 AVDASharedState::~AVDASharedState() {
   if (!surface_texture_service_id_)
@@ -107,4 +114,14 @@ void AVDASharedState::RenderCodecBufferToSurfaceTexture(
   release_time_ = base::TimeTicks::Now();
 }
 
+void AVDASharedState::UpdateTexImage() {
+  surface_texture_->UpdateTexImage();
+  // Helpfully, this is already column major.
+  surface_texture_->GetTransformMatrix(gl_matrix_);
+}
+
+void AVDASharedState::GetTransformMatrix(float matrix[16]) const {
+  memcpy(matrix, gl_matrix_, sizeof(gl_matrix_));
+}
+
 }  // namespace media