Add GL_TEXTURE_EXTERNAL_OES as supported texture target for CHROMIUM_map_image.

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 91aefdd4fd31731f4ccbd678b48f77b1813844be..3d364a2d207ea6fa9c582727da74ae94431fb5d3 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -110,14 +110,10 @@ unsigned GetMapImageTextureTarget(cc::ContextProvider* context_provider) {
   if (!context_provider)
     return GL_TEXTURE_2D;
 
-  // TODO(reveman): Determine if GL_TEXTURE_EXTERNAL_OES works well on
-  // Android before we enable this. crbug.com/322780
-#if !defined(OS_ANDROID)
   if (context_provider->ContextCapabilities().gpu.egl_image_external)
     return GL_TEXTURE_EXTERNAL_OES;
   if (context_provider->ContextCapabilities().gpu.texture_rectangle)
     return GL_TEXTURE_RECTANGLE_ARB;
-#endif
 
   return GL_TEXTURE_2D;
 }