ozone: Implement zero/one-copy texture for Ozone GBM.

build/linux/system.gyp

 # Copyright (c) 2012 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': {
     'conditions': [
       ['sysroot!=""', {
         'pkg-config': '<(chroot_cmd) ./pkg-config-wrapper "<(sysroot)" "<(target_arch)" "<(system_libdir)"',
       }, {
@@ skipping 514 matching lines @@
             'ldflags': [
               '<!@(<(pkg-config) --libs-only-L --libs-only-other gbm)',
             ],
             'libraries': [
               '<!@(<(pkg-config) --libs-only-l gbm)',
             ],
           },
         },
       ],
     }],
+    ['use_ozone==1', {

[vignatti (out of this project), 2015/05/14 19:20:04]

vgem only makes sense now under gbm, so you want to wrap this around
use_platform_gbm variable instead. Similarly, you will need to apply this same
logic for the gn and gyp code you're changing next in this CL. 

[dshwang, 2015/06/25 10:59:56]

indeed, but spang don't want to leak use_platform_gbm outside ui/ozone. target
drmheader is used in sandbox gyp. we don't want to let sandbox know ozone
platform detail. spang, do you have good idea?

+      'targets': [
+        {
+          'target_name': 'drmheader',
+          'type': 'none',
+          'direct_dependent_settings': {
+            'cflags': [
+              '<!@(<(pkg-config) --cflags libdrm)',
+            ],
+          },
+        },
+      ],
+    }],
     ['ozone_platform_dri==1 or ozone_platform_drm==1 or ozone_platform_gbm==1', {
       'targets': [
         {
           'target_name': 'libdrm',
           'type': 'none',
           'direct_dependent_settings': {
             'cflags': [
               '<!@(<(pkg-config) --cflags libdrm)',
             ],
           },
@@ skipping 676 matching lines @@
                   },
                 }],
               ],
             }],
           ]
         }],
       ],
     },
   ],
 }