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..f3d01316a0926ec4c5573674ce10651b0b5dcb73 100644
--- a/mojo/gpu/mojo_gles2_impl_autogen.cc
+++ b/mojo/gpu/mojo_gles2_impl_autogen.cc
@@ -1615,6 +1615,10 @@ void MojoGLES2Impl::MatrixLoadfCHROMIUM(GLenum matrixMode, const GLfloat* m) {
 void MojoGLES2Impl::MatrixLoadIdentityCHROMIUM(GLenum matrixMode) {
   NOTREACHED() << "Unimplemented MatrixLoadIdentityCHROMIUM.";
 }
+GLenum MojoGLES2Impl::GetGraphicsResetStatusKHR() {
+  NOTREACHED() << "Unimplemented GetGraphicsResetStatusKHR.";
+  return 0;
+}
 void MojoGLES2Impl::BlendBarrierKHR() {
   NOTREACHED() << "Unimplemented BlendBarrierKHR.";
 }