Update viz test context provider to provide GL integers required by Skia.

Bug: 644851
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I759a98701d50bad4347ae5f44e49a11a3b9cdd45
Reviewed-on: https://chromium-review.googlesource.com/1054526
Commit-Queue: Brian Salomon <bsalomon@chromium.org>
Reviewed-by: weiliangc <weiliangc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562002}

components/viz/test/test_context_provider.cc

@@ -68,15 +68,21 @@ class TestGLES2InterfaceForContextProvider : public TestGLES2Interface {
       case GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS:
         *params = 8;
         return;
-      case GL_MAX_TEXTURE_SIZE:
+      case GL_MAX_RENDERBUFFER_SIZE:
         *params = 2048;
         break;
-      case GL_MAX_RENDERBUFFER_SIZE:
+      case GL_MAX_TEXTURE_SIZE:
         *params = 2048;
         break;
+      case GL_MAX_TEXTURE_IMAGE_UNITS:
+        *params = 8;
+        break;
       case GL_MAX_VERTEX_ATTRIBS:
         *params = 8;
         break;
+      case GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS:
+        *params = 0;
+        return;
       default:
         break;
     }