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

ui/ozone/platform/drm/BUILD.gn

Index: ui/ozone/platform/drm/BUILD.gn
diff --git a/ui/ozone/platform/drm/BUILD.gn b/ui/ozone/platform/drm/BUILD.gn
index 801b02146f47ef5f826cd22e5e25df558cb89ea7..47fdd960f9d6c573df4bdfb3510bbf69eb3a4e0c 100644
--- a/ui/ozone/platform/drm/BUILD.gn
+++ b/ui/ozone/platform/drm/BUILD.gn
@@ -8,6 +8,10 @@ import("//ui/ozone/ozone.gni")
 declare_args() {
   use_mesa_platform_null = false
   use_drm_atomic = false
+
+  # TODO(dshwang): remove this flag when all gbm hardware supports vgem map.
+  # crbug.com/519587
+  ozone_use_vgem_map = false

[spang, 2015/08/12 21:40:03]

remove ozone_ prefix

[dshwang, 2015/08/13 11:30:55]

Done.

 }
 
 pkg_config("libdrm") {
@@ -197,5 +201,14 @@ if (ozone_platform_gbm) {
     if (use_mesa_platform_null) {
       defines += [ "USE_MESA_PLATFORM_NULL" ]
     }
+
+    if (ozone_use_vgem_map) {
+      defines += [ "OZONE_USE_VGEM_MAP" ]

[spang, 2015/08/12 21:40:03]

remove OZONE_ prefix

[dshwang, 2015/08/13 11:30:55]

Done.

+
+      sources = [
+        "gpu/client_native_pixmap_vgem.cc",
+        "gpu/client_native_pixmap_vgem.h",
+      ]
+    }
   }
 }