Gyp support for Ozone.

build/common_defines.gypi

@@ -13,6 +13,14 @@
 
         'angle_build_winrt%': '0',
         'angle_build_winphone%': '0',
+
+        # This works like the Ozone GBM platform in Chrome:
+        # - Generic Buffer Manager (gbm) to allocate buffers
+        # - EGL_EXT_image_dma_buf_import to render into those buffers via EGLImage
+        # - Direct Rendering Manager + Kernel Mode Setting to scan out from those buffers
+        # - EGL_PLATFORM_SURFACELESS because there are no native windows
+        'use_ozone%': 0,
+
         'conditions':
         [
             ['OS=="linux" and use_x11==1 and chromeos==0', {
@@ -38,6 +46,10 @@
     ],
     'conditions':
     [
+        ['use_ozone==1',
+        {
+            'defines': [ 'USE_OZONE' ],
+        }],
         ['component=="shared_library"',
         {
             'defines': [ 'COMPONENT_BUILD' ],

build/standalone.gypi

@@ -17,9 +17,13 @@
         # eagerly than other conditional variables.
         'variables':
         {
+            'variables':
+            {
+                'use_ozone%': 0,
+            },
             'conditions':
             [
-                ['OS=="linux"',
+                ['OS=="linux" and use_ozone==0',
                 {
                     'use_x11': 1,
                 },
@@ -27,6 +31,9 @@
                     'use_x11': 0,
                 }],
             ],
+
+            # Copy conditionally-set variables out one scope.
+            'use_ozone%': '<(use_ozone)',
         },
 
         # Copy conditionally-set variables out one scope.

src/angle.gyp

@@ -38,6 +38,10 @@
             {
                 'angle_enable_gl%': 1,
             }],
+            ['use_ozone==1',
+            {
+                'angle_enable_gl%': 1,
+            }],
         ],
     },
     'includes':