gpu: Introduce separate mojo api for failed initialization.

services/ui/ws/gpu_host.cc

Index: services/ui/ws/gpu_host.cc
diff --git a/services/ui/ws/gpu_host.cc b/services/ui/ws/gpu_host.cc
index 1414fe28e7693b6abbeedeaa78d4058f2cb1c432..e19300cef44c430f0da7bda25eaf00e189ce961d 100644
--- a/services/ui/ws/gpu_host.cc
+++ b/services/ui/ws/gpu_host.cc
@@ -93,11 +93,14 @@ void GpuHost::OnBadMessageFromGpu() {
   NOTIMPLEMENTED();
 }
 
-void GpuHost::DidInitialize(const gpu::GPUInfo& gpu_info) {
+void GpuHost::DidInitialize(const gpu::GPUInfo& gpu_info,
+                            const gpu::GpuFeatureInfo& gpu_feature_info) {
   gpu_info_ = gpu_info;
   delegate_->OnGpuServiceInitialized();
 }
 
+void GpuHost::DidFailInitialize() {}
+
 void GpuHost::DidCreateOffscreenContext(const GURL& url) {}
 
 void GpuHost::DidDestroyOffscreenContext(const GURL& url) {}