Add remaining trivial targets for the Linux GN build

This patch adds a whole bunch of small targets that
had either already been done but weren't mentioned
in the 'gn_all' group, or needed to be done.

In theory this should produce no change on any platform
other than Linux, except for one small windows target.

[email protected]
[email protected]
BUG=432959
CQ_EXTRA_TRYBOTS=tryserver.chromium.linux:android_chromium_gn_compile_dbg,android_chromium_gn_compile_rel;tryserver.chromium.win:win8_chromium_gn_rel,win8_chromium_gn_dbg;tryserver.chromium.mac:mac_chromium_gn_rel,mac_chromium_gn_dbg

Review URL: https://codereview.chromium.org/975123003

Cr-Commit-Position: refs/heads/master@{#319580}
diff --git a/gpu/BUILD.gn b/gpu/BUILD.gn
index 830464e9..7c9d732 100644
--- a/gpu/BUILD.gn
+++ b/gpu/BUILD.gn
@@ -34,6 +34,7 @@
 # gpu/skia_bindings/skia_bindings.gyp:gpu_skia_bindings => //gpu/skia_bindings
 
 import("//testing/test.gni")
+import("//build/config/ui.gni")
 
 component("gpu") {
   public_deps = [
@@ -282,3 +283,25 @@
     "//third_party/angle:translator_static",
   ]
 }
+
+if (is_linux && !is_chromeos && target_cpu != "arm" && use_x11) {
+  executable("compositor_model_bench") {
+    sources = [
+      "tools/compositor_model_bench/compositor_model_bench.cc",
+      "tools/compositor_model_bench/forward_render_model.cc",
+      "tools/compositor_model_bench/render_model_utils.cc",
+      "tools/compositor_model_bench/render_models.cc",
+      "tools/compositor_model_bench/render_tree.cc",
+      "tools/compositor_model_bench/shaders.cc",
+    ]
+
+    libs = [ "GL" ]
+
+    configs += [ "//build/config/linux:x11" ]
+
+    deps = [
+      "//base",
+      "//ui/gl",
+    ]
+  }
+}