GN: Enable ui/keyboard:keyboard_unittests, fix up webui targets

ui/gl/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/ui.gni")
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 gl_binding_output_dir = target_gen_dir
@@ skipping 134 matching lines @@
       "$gl_binding_output_dir/gl_bindings_autogen_egl.cc",
       "$gl_binding_output_dir/gl_bindings_autogen_egl.h",
     ]
   }
   if (is_android || is_linux) {
     sources += [
       "gl_implementation_osmesa.cc",
       "gl_implementation_osmesa.h",
     ]
   }
+  if (is_linux) {
+    deps += [ "//third_party/libevent" ]
+  }
   if (use_x11) {
     sources += [
       "gl_context_glx.cc",
       "gl_context_glx.h",
       "gl_context_x11.cc",
       "gl_glx_api_implementation.cc",
       "gl_glx_api_implementation.h",
       "gl_image_glx.cc",
       "gl_image_glx.h",
       "gl_implementation_x11.cc",
@@ skipping 174 matching lines @@
   generate_jni("gl_jni_headers") {
     deps = [ ":surface_jni_headers" ]
     forward_dependent_configs_from = [ ":surface_jni_headers" ]
     sources = [
       "../android/java/src/org/chromium/ui/gl/SurfaceTextureListener.java",
       "../android/java/src/org/chromium/ui/gl/SurfaceTexturePlatformWrapper.java",
     ]
     jni_package = "ui/gl"
   }
 }