media: replace LUMINANCE_F16 by RG_88 for 9/10-bit h264 videos

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 c3012335d0a597f61a00d81fa9f9817be8057ca8..bb3b60321557e3665930fb9ae1b4791e9b6850ca 100644
--- a/cc/test/test_web_graphics_context_3d.h
+++ b/cc/test/test_web_graphics_context_3d.h
@@ -342,6 +342,9 @@ class TestWebGraphicsContext3D {
   void set_support_texture_half_float_linear(bool support) {
     test_capabilities_.texture_half_float_linear = support;
   }
+  void set_support_texture_rg(bool support) {
+    test_capabilities_.texture_rg = support;
+  }
   void set_msaa_is_slow(bool msaa_is_slow) {
     test_capabilities_.msaa_is_slow = msaa_is_slow;
   }