Do not update, and return the previous matrix if surface_texture_ is null.

gpu/ipc/service/stream_texture_android.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/ipc/service/stream_texture_android.h"
 
 #include <string.h>
 
 #include "base/bind.h"
 #include "base/strings/stringize_macros.h"
@@ skipping 73 matching lines @@
 
 StreamTexture::~StreamTexture() {
   if (owner_stub_) {
     owner_stub_->RemoveDestructionObserver(this);
     owner_stub_->channel()->RemoveRoute(route_id_);
   }
 }
 
 // gpu::gles2::GLStreamTextureMatrix implementation
 void StreamTexture::GetTextureMatrix(float xform[16]) {
-  UpdateTexImage();
-  surface_texture_->GetTransformMatrix(xform);
+  if (surface_texture_) {
+    UpdateTexImage();
+    surface_texture_->GetTransformMatrix(current_matrix_);
+  }
+  memcpy(xform, current_matrix_, sizeof(current_matrix_));
 }
 
 void StreamTexture::OnWillDestroyStub() {
   owner_stub_->RemoveDestructionObserver(this);
   owner_stub_->channel()->RemoveRoute(route_id_);
 
   if (framebuffer_) {
     std::unique_ptr<ui::ScopedMakeCurrent> scoped_make_current(
         MakeStubCurrent());
 
@@ skipping 163 matching lines @@
   return false;
 }
 
 void StreamTexture::OnMemoryDump(base::trace_event::ProcessMemoryDump* pmd,
                                  uint64_t process_tracing_id,
                                  const std::string& dump_name) {
   // TODO(ericrk): Add OnMemoryDump for GLImages. crbug.com/514914
 }
 
 }  // namespace gpu