Revert of cc: Implement shared worker contexts.

ui/compositor/test/in_process_context_factory.cc

Index: ui/compositor/test/in_process_context_factory.cc
diff --git a/ui/compositor/test/in_process_context_factory.cc b/ui/compositor/test/in_process_context_factory.cc
index 1d96e0188b1639283e6b47312d1a111ba0002c1d..942947d5b1b020f3ebfcfe21cc7cf2097d2067cb 100644
--- a/ui/compositor/test/in_process_context_factory.cc
+++ b/ui/compositor/test/in_process_context_factory.cc
@@ -112,37 +112,19 @@
       InProcessContextProvider::Create(attribs, &gpu_memory_buffer_manager_,
                                        &image_factory_,
                                        compositor->widget(), "UICompositor");
-
-  // Try to reuse existing shared worker context provider.
-  bool shared_worker_context_provider_lost = false;
-  if (shared_worker_context_provider_) {
-    // Note: If context is lost, delete reference after releasing the lock.
-    base::AutoLock lock(*shared_worker_context_provider_->GetLock());
-    if (shared_worker_context_provider_->ContextGL()
-            ->GetGraphicsResetStatusKHR() != GL_NO_ERROR) {
-      shared_worker_context_provider_lost = true;
-    }
-  }
-  if (!shared_worker_context_provider_ || shared_worker_context_provider_lost) {
-    shared_worker_context_provider_ = InProcessContextProvider::CreateOffscreen(
-        &gpu_memory_buffer_manager_, &image_factory_);
-    if (shared_worker_context_provider_ &&
-        !shared_worker_context_provider_->BindToCurrentThread())
-      shared_worker_context_provider_ = nullptr;
-    if (shared_worker_context_provider_)
-      shared_worker_context_provider_->SetupLock();
-  }
+  scoped_refptr<InProcessContextProvider> worker_context_provider =
+      InProcessContextProvider::CreateOffscreen(&gpu_memory_buffer_manager_,
+                                                &image_factory_);
 
   scoped_ptr<cc::OutputSurface> real_output_surface;
 
   if (use_test_surface_) {
     bool flipped_output_surface = false;
     real_output_surface = make_scoped_ptr(new cc::PixelTestOutputSurface(
-        context_provider, shared_worker_context_provider_,
-        flipped_output_surface));
+        context_provider, worker_context_provider, flipped_output_surface));
   } else {
-    real_output_surface = make_scoped_ptr(new DirectOutputSurface(
-        context_provider, shared_worker_context_provider_));
+    real_output_surface = make_scoped_ptr(
+        new DirectOutputSurface(context_provider, worker_context_provider));
   }
 
   if (surface_manager_) {
@@ -154,7 +136,7 @@
     scoped_ptr<cc::SurfaceDisplayOutputSurface> surface_output_surface(
         new cc::SurfaceDisplayOutputSurface(
             surface_manager_, compositor->surface_id_allocator(),
-            context_provider, shared_worker_context_provider_));
+            context_provider, worker_context_provider));
     display_client->set_surface_output_surface(surface_output_surface.get());
     surface_output_surface->set_display_client(display_client.get());