Allow creating GLImage-backed textures with glTexStorage2D.

cc/test/test_web_graphics_context_3d.h

Index: cc/test/test_web_graphics_context_3d.h
diff --git a/cc/test/test_web_graphics_context_3d.h b/cc/test/test_web_graphics_context_3d.h
index c50893f90fab45d282541ee2248b79b1bdc7d26a..f003b1a0b01fab1852beb7b68e35dbf41e22ac0c 100644
--- a/cc/test/test_web_graphics_context_3d.h
+++ b/cc/test/test_web_graphics_context_3d.h
@@ -359,6 +359,9 @@ class TestWebGraphicsContext3D {
   void set_support_multisample_compatibility(bool support) {
     test_capabilities_.multisample_compatibility = support;
   }
+  void set_support_texture_buffer_chromium(bool support) {
+    test_capabilities_.texture_buffer_chromium = support;
+  }
 
   // When this context is lost, all contexts in its share group are also lost.
   void add_share_group_context(TestWebGraphicsContext3D* context3d) {