GPU demos are working on windows and linux. Enabled gpu.gyp and gpu/demos.gyp...

gpu/demos/demos.gyp

 # Copyright (c) 2009 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.
 
 {
   'variables': {
     'chromium_code': 1,
     'conditions': [
       # Pepper demos that are compiled as shared libraries need to be compiled
       # with -fPIC flag. All static libraries that these demos depend on must
       # also be compiled with -fPIC flag. Setting GYP_DEFINES="linux_fpic=1"
       # compiles everything with -fPIC. Disable pepper demos on linux/x64
       # unless linux_fpic is 1.
       ['OS=="linux" and (target_arch=="x64" or target_arch=="arm") and linux_fpic!=1', {
         'enable_pepper_demos%': 0,
       }, {
         'enable_pepper_demos%': 1,
       }],
     ],
   },
-  'includes': [
-    '../../build/common.gypi',
-  ],
   'targets': [
     {
       'target_name': 'gpu_demo_framework',
       'type': 'static_library',
       'dependencies': [
         '../../base/base.gyp:base',
       ],
       'sources': [
         'framework/demo.cc',
         'framework/demo.h',
         'framework/demo_factory.h',
       ],
     },
     {
       'target_name': 'gpu_demo_framework_exe',
       'type': 'static_library',
       'dependencies': [
         'gpu_demo_framework',
         '../gpu.gyp:command_buffer_client',
         '../gpu.gyp:command_buffer_service',
       ],
       'sources': [
         'framework/main_exe.cc',
         'framework/window.cc',
+        'framework/window_linux.cc',
+        'framework/window_mac.mm',
+        'framework/window_win.cc',
         'framework/window.h',
       ],
       'conditions': [
         ['OS=="linux"', {
-          'sources': ['framework/window_linux.cc'],
           'dependencies': ['../../build/linux/system.gyp:gtk'],
         }],
-        ['OS=="mac"', {
-          'sources': ['framework/window_mac.mm'],
-        }],
-        ['OS=="win"', {
-          'sources': ['framework/window_win.cc'],
-        }],
       ],
     },
     {
       'target_name': 'gpu_demo_framework_pepper',
       'type': 'static_library',
       'dependencies': [
         'gpu_demo_framework',
         '../gpu.gyp:pgl',
       ],
       'sources': [
         'framework/plugin.cc',
         'framework/plugin.h',
       ],
       'direct_dependent_settings': {
         'sources': [
           'framework/main_pepper.cc',
         ],
+        'run_as': {
+          'action': [
+            '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)chrome<(EXECUTABLE_SUFFIX)',
+            '--no-sandbox',
+            '--internal-pepper',
+            '--enable-gpu-plugin',
+            '--load-plugin=$(TargetPath)',
+            'file://$(ProjectDir)pepper_gpu_demo.html',
+          ],
+        },
         'conditions': [
           ['OS=="win"', {
             'sources': [
               'framework/plugin.def',
               'framework/plugin.rc',
             ],
-            'run_as': {
-              'action': [
-                '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)chrome<(EXECUTABLE_SUFFIX)',
-                '--no-sandbox',
-                '--internal-pepper',
-                '--enable-gpu-plugin',
-                '--load-plugin=$(TargetPath)',
-                'file://$(ProjectDir)pepper_gpu_demo.html',
-              ],
-            },
           }],
           ['OS=="linux"', {
             # -gstabs, used in the official builds, causes an ICE. Remove it.
             'cflags!': ['-gstabs'],
           }],
         ],
       },
     },
     {
       'target_name': 'hello_triangle_exe',
@@ skipping 170 matching lines @@
       ],
     }],
   ],
 }
 
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