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

gpu/ipc/service/stream_texture_android.cc

Index: gpu/ipc/service/stream_texture_android.cc
diff --git a/gpu/ipc/service/stream_texture_android.cc b/gpu/ipc/service/stream_texture_android.cc
index 49ad894acc0d18cfaf7f6dcc67d4b5ecf93eac23..1cb840c18b8bee0febfa0ed728f72f5f65babe42 100644
--- a/gpu/ipc/service/stream_texture_android.cc
+++ b/gpu/ipc/service/stream_texture_android.cc
@@ -91,8 +91,11 @@ StreamTexture::~StreamTexture() {
 
 // 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() {