Revert "Disable coverage counting by default"

This reverts commit 576b2a5596bc8dda294a069e3fdc6b8b8e48ffcf.

Reason for revert: DDL and MSRTC unhappy

Original change's description:
> Disable coverage counting by default
> 
> Bug: skia:
> Change-Id: Iacb4cb3e409c6abdd25319ec0884ef673fb04cec
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/201101
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Chris Dalton <csmartdalton@google.com>

TBR=djsollen@google.com,bsalomon@google.com,csmartdalton@google.com

Change-Id: Iabdb3116d97c7470044b962ff78cffd47ccee744
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/201933
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
diff --git a/tools/flags/SkCommonFlags.cpp b/tools/flags/SkCommonFlags.cpp
index dfacdbe..be569f8 100644
--- a/tools/flags/SkCommonFlags.cpp
+++ b/tools/flags/SkCommonFlags.cpp
@@ -161,7 +161,7 @@
 
 DEFINE_bool(noGS, false, "Disables support for geometry shaders.");
 
-DEFINE_string(pr, "",
+DEFINE_string(pr, "all",
               "Set of enabled gpu path renderers. Defined as a list of: "
               "[~]none [~]dashline [~]nvpr [~]ccpr [~]aahairline [~]aaconvex [~]aalinearizing "
               "[~]small [~]tess] [~]all");
diff --git a/tools/flags/SkCommonFlagsGpu.h b/tools/flags/SkCommonFlagsGpu.h
index 65871e3..d546078 100644
--- a/tools/flags/SkCommonFlagsGpu.h
+++ b/tools/flags/SkCommonFlagsGpu.h
@@ -46,9 +46,9 @@
 
 inline GpuPathRenderers CollectGpuPathRenderersFromFlags() {
     if (FLAGS_pr.isEmpty()) {
-        return GpuPathRenderers::kDefault;
+        return GpuPathRenderers::kAll;
     }
-    GpuPathRenderers gpuPathRenderers = ('~' == FLAGS_pr[0][0])
+    GpuPathRenderers gpuPathRenderers = '~' == FLAGS_pr[0][0]
             ? GpuPathRenderers::kAll : GpuPathRenderers::kNone;
     for (int i = 0; i < FLAGS_pr.count(); ++i) {
         const char* name = FLAGS_pr[i];
diff --git a/tools/viewer/Viewer.cpp b/tools/viewer/Viewer.cpp
index 0e82bd1..2defcb5 100644
--- a/tools/viewer/Viewer.cpp
+++ b/tools/viewer/Viewer.cpp
@@ -219,7 +219,6 @@
 {
     SkGraphics::Init();
 
-    gPathRendererNames[GpuPathRenderers::kDefault] = "Default Path Renderers";
     gPathRendererNames[GpuPathRenderers::kAll] = "All Path Renderers";
     gPathRendererNames[GpuPathRenderers::kStencilAndCover] = "NV_path_rendering";
     gPathRendererNames[GpuPathRenderers::kSmall] = "Small paths (cached sdf or alpha masks)";
@@ -876,7 +875,7 @@
     title.append("]");
 
     GpuPathRenderers pr = fWindow->getRequestedDisplayParams().fGrContextOptions.fGpuPathRenderers;
-    if (GpuPathRenderers::kDefault != pr) {
+    if (GpuPathRenderers::kAll != pr) {
         title.appendf(" [Path renderer: %s]", gPathRendererNames[pr].c_str());
     }
 
@@ -1564,7 +1563,6 @@
                     if (!ctx) {
                         ImGui::RadioButton("Software", true);
                     } else if (fWindow->sampleCount() > 1) {
-                        prButton(GpuPathRenderers::kDefault);
                         prButton(GpuPathRenderers::kAll);
                         if (ctx->priv().caps()->shaderCaps()->pathRenderingSupport()) {
                             prButton(GpuPathRenderers::kStencilAndCover);
@@ -1572,7 +1570,6 @@
                         prButton(GpuPathRenderers::kTessellating);
                         prButton(GpuPathRenderers::kNone);
                     } else {
-                        prButton(GpuPathRenderers::kDefault);
                         prButton(GpuPathRenderers::kAll);
                         if (GrCoverageCountingPathRenderer::IsSupported(
                                     *ctx->priv().caps())) {
@@ -2077,7 +2074,6 @@
             } else {
                 const auto* caps = ctx->priv().caps();
 
-                writer.appendString(gPathRendererNames[GpuPathRenderers::kDefault].c_str());
                 writer.appendString(gPathRendererNames[GpuPathRenderers::kAll].c_str());
                 if (fWindow->sampleCount() > 1) {
                     if (caps->shaderCaps()->pathRenderingSupport()) {