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

gpu/command_buffer/client/gles2_implementation.cc

Index: gpu/command_buffer/client/gles2_implementation.cc
diff --git a/gpu/command_buffer/client/gles2_implementation.cc b/gpu/command_buffer/client/gles2_implementation.cc
index 7708bc129c7aec036cc6186e7ab3d128beec0a79..c8618f4c16d405d36964eee2e85b325c2b1702a3 100644
--- a/gpu/command_buffer/client/gles2_implementation.cc
+++ b/gpu/command_buffer/client/gles2_implementation.cc
@@ -4103,6 +4103,12 @@ void GLES2Implementation::GetVertexAttribIuiv(
   CheckGLError();
 }
 
+GLboolean GLES2Implementation::IsContextLost() {
+  GPU_CLIENT_SINGLE_THREAD_CHECK();
+  GPU_CLIENT_LOG("[" << GetLogPrefix() << "] glIsContextLost()");
+  return helper_->IsContextLost();
+}
+
 void GLES2Implementation::Swap() {
   SwapBuffers();
 }