DCHECK if shader compilation fails that it's due to context loss.

mojo/gpu/mojo_gles2_impl_autogen.cc

Index: mojo/gpu/mojo_gles2_impl_autogen.cc
diff --git a/mojo/gpu/mojo_gles2_impl_autogen.cc b/mojo/gpu/mojo_gles2_impl_autogen.cc
index 2ffcbf1524517c52bf4ce43ccb871736f004e955..fecbc3e8ed1e2863eb19f8f5882e92ff155e23e6 100644
--- a/mojo/gpu/mojo_gles2_impl_autogen.cc
+++ b/mojo/gpu/mojo_gles2_impl_autogen.cc
@@ -1609,6 +1609,10 @@ void MojoGLES2Impl::ScheduleOverlayPlaneCHROMIUM(GLint plane_z_order,
 void MojoGLES2Impl::SwapInterval(GLint interval) {
   NOTREACHED() << "Unimplemented SwapInterval.";
 }
+GLenum MojoGLES2Impl::GetGraphicsResetStatusKHR() {
+  NOTREACHED() << "Unimplemented GetGraphicsResetStatusKHR.";
+  return 0;
+}
 void MojoGLES2Impl::MatrixLoadfCHROMIUM(GLenum matrixMode, const GLfloat* m) {
   NOTREACHED() << "Unimplemented MatrixLoadfCHROMIUM.";
 }