Work on Windows GN component build.

gpu/command_buffer/common/BUILD.gn

Index: gpu/command_buffer/common/BUILD.gn
diff --git a/gpu/command_buffer/common/BUILD.gn b/gpu/command_buffer/common/BUILD.gn
index 57935ac4cead8d32a3c751f362106d1626f3db2b..babaa42e9991fc30fc9a0601b20bbcd08a629213 100644
--- a/gpu/command_buffer/common/BUILD.gn
+++ b/gpu/command_buffer/common/BUILD.gn
@@ -2,7 +2,24 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-source_set("common") {
+# The files here go into the "gpu" component in a component build (with
+# "command_buffer_common" just forwarding) and goes into a static library in
+# non-component build.

[Dirk Pranke, 2015/04/06 16:54:07]

same comment?

+group("common") {
+  if (is_component_build) {
+    public_deps = [
+      "//gpu",
+    ]
+  } else {
+    public_deps = [
+      ":common_sources",
+    ]
+  }
+}
+
+source_set("common_sources") {
+  visibility = [ "//gpu/*" ]
+
   sources = [
     "bitfield_helpers.h",
     "buffer.cc",