ui/compositor: Provide its own 'in process' ContextProvider.

ui/compositor/BUILD.gn

Index: ui/compositor/BUILD.gn
diff --git a/ui/compositor/BUILD.gn b/ui/compositor/BUILD.gn
index 047aa166adc4006a518cb72cbd6eaa18c018979b..b88652c2fa6b7cc5c2566d20b1ff9f456b5758a5 100644
--- a/ui/compositor/BUILD.gn
+++ b/ui/compositor/BUILD.gn
@@ -85,8 +85,12 @@ source_set("test_support") {
     "test/context_factories_for_test.h",
     "test/draw_waiter_for_test.cc",
     "test/draw_waiter_for_test.h",
+    "test/grcontext_for_webgraphicscontext3d.cc",
+    "test/grcontext_for_webgraphicscontext3d.h",
     "test/in_process_context_factory.cc",
     "test/in_process_context_factory.h",
+    "test/in_process_context_provider.cc",
+    "test/in_process_context_provider.h",
     "test/layer_animator_test_controller.cc",
     "test/layer_animator_test_controller.h",
     "test/test_compositor_host.h",
@@ -120,7 +124,6 @@ source_set("test_support") {
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gl",
-    "//webkit/common/gpu",
   ]
 
   if (use_x11) {