Only create SkiaRenderer with GPU compositing.

The SkiaRenderer cannot handle SW compositing, chrome will crash if
the SkiaRenderer is created with a SW output surface. This CL fixes
the crash.

Bug: None
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: I8e60c6e07a2f39cfda58af3a1ae7f190d3ed88f6
Reviewed-on: https://chromium-review.googlesource.com/1101159
Commit-Queue: Peng Huang <penghuang@chromium.org>
Reviewed-by: weiliangc <weiliangc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567426}

components/viz/service/display/display.cc

@@ -211,7 +211,9 @@ void Display::InitializeRenderer() {
   resource_provider_ = std::make_unique<DisplayResourceProvider>(
       mode, output_surface_->context_provider(), bitmap_manager_);
 
-  if (settings_.use_skia_renderer) {
+  if (settings_.use_skia_renderer && mode == DisplayResourceProvider::kGpu) {
+    // Check the compositing mode, because SkiaRenderer only works with GPU
+    // compositing.
     DCHECK(output_surface_);
     renderer_ = std::make_unique<SkiaRenderer>(
         &settings_, output_surface_.get(), resource_provider_.get(),