Change the overdraw color to a GPU friendly color

When skia works in CPU mode, color should be 0x00000000, 0x00000000,0x2f0000ff,
0x2f00ff00, 0x3fff0000, 0x7fff0000. When it turns to GPU, the R and B should be
swapped.

Skia mainly works in GPU mode, so change this color to a GPU friendly color.

However, the best solution is to support both CPU mode and GPU mode. Add TODO
for this.

Bug: 889122
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: I71aa1d2ae34ab10a41ba5d58e1e2cbb6867bec6b
Reviewed-on: https://chromium-review.googlesource.com/c/1253407Reviewed-by: enne <enne@chromium.org>
Commit-Queue: Xing Xu <xing.xu@intel.com>
Cr-Commit-Position: refs/heads/master@{#601344}

components/viz/service/display/skia_renderer.cc

@@ -264,8 +264,10 @@ void SkiaRenderer::FinishDrawingFrame() {
   if (settings_->show_overdraw_feedback) {
     sk_sp<SkImage> image = overdraw_surface_->makeImageSnapshot();
     SkPaint paint;
+    // TODO(xing.xu) : handle this in CPU mode, the R and B should be switched
+    // in CPU mode. (http://crbug.com/896969)
     static const SkPMColor colors[SkOverdrawColorFilter::kNumColors] = {
-        0x00000000, 0x00000000, 0x2f0000ff, 0x2f00ff00, 0x3fff0000, 0x7fff0000,
+        0x00000000, 0x00000000, 0x2fff0000, 0x2f00ff00, 0x3f0000ff, 0x7f0000ff,
     };
     sk_sp<SkColorFilter> color_filter = SkOverdrawColorFilter::Make(colors);
     paint.setColorFilter(color_filter);