gpu: Move ContextProviderCommandBuffer into mus gpu client-lib.

services/ui/public/cpp/gpu/BUILD.gn

Index: services/ui/public/cpp/gpu/BUILD.gn
diff --git a/services/ui/public/cpp/gpu/BUILD.gn b/services/ui/public/cpp/gpu/BUILD.gn
index 13cd0b8c21a42ec7a39552cbcdb291f9b5425680..10e25a19f6c147d55b0b438a25902116aa7774fb 100644
--- a/services/ui/public/cpp/gpu/BUILD.gn
+++ b/services/ui/public/cpp/gpu/BUILD.gn
@@ -6,13 +6,19 @@ import("//build/config/ui.gni")
 
 source_set("gpu") {
   sources = [
+    "command_buffer_metrics.h",
+    "context_provider_command_buffer.h",
     "gpu.h",
   ]
 
-  deps = [
+  public_deps = [
     ":internal",
+    "//cc",
+    "//gpu/command_buffer/common:gles2_utils",
     "//gpu/ipc/client",
+    "//gpu/ipc/common",
     "//services/ui/public/interfaces",
+    "//url",
   ]
 
   allow_circular_includes_from = [ ":internal" ]
@@ -27,13 +33,18 @@ source_set("internal") {
   sources = [
     "client_gpu_memory_buffer_manager.cc",
     "client_gpu_memory_buffer_manager.h",
+    "command_buffer_metrics.cc",
+    "context_provider_command_buffer.cc",
     "gpu.cc",
   ]
 
   deps = [
     "//base",
+    "//cc",
+    "//gpu",
     "//gpu/command_buffer/client",
-    "//gpu/ipc/client",
+    "//gpu/command_buffer/client:gles2_implementation",
+    "//gpu/skia_bindings",
     "//mojo/public/cpp/system",
     "//services/service_manager/public/cpp",
     "//services/ui/common:mus_common",