Set stencil_bits to 0 for SkiaRenderer

In SkiaOutputDeviceGL we are creating a GrBackendRenderTarget and saying
we have created a stencil buffer for it. From what I can tell, we
haven't actually created the stencil buffer anywhere. In theory this
should have no memory impact since Skia just thinks there is a stencil
buffer but doesn't allocate it. Skia should only allocate a small C++
object to track the stencil buffer memory it thinks was allocated.

However, pinpoint found a statistically significant memory difference
with this change on some stories. This CL fixes skia category memory
tracing to be more accurate as well.

Bug: 1055190
Change-Id: Ic9a195f3fd68b8c58a65863018307c1b2d7da8b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2112148
Commit-Queue: kylechar <kylechar@chromium.org>
Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753307}

components/viz/service/display_embedder/skia_output_device_gl.cc

@@ -146,8 +146,9 @@ bool SkiaOutputDeviceGL::Reshape(const gfx::Size& size,
   // used with Windows updated RS3 (2017) as a workaround for a DWM bug so it
   // might not be relevant to support anymore as a result.
 
-  GrBackendRenderTarget render_target(size.width(), size.height(), 0, 8,
-                                      framebuffer_info);
+  GrBackendRenderTarget render_target(size.width(), size.height(),
+                                      /*sampleCnt=*/0,
+                                      /*stencilBits=*/0, framebuffer_info);
   auto origin = (gl_surface_->GetOrigin() == gfx::SurfaceOrigin::kTopLeft)
                     ? kTopLeft_GrSurfaceOrigin
                     : kBottomLeft_GrSurfaceOrigin;

components/viz/service/display_embedder/skia_output_device_webview.cc

@@ -112,8 +112,9 @@ void SkiaOutputDeviceWebView::InitSkiaSurface(unsigned int fbo) {
             supports_alpha_ ? GrGLFormat::kRGBA8 : GrGLFormat::kRGB8);
   SkColorType color_type = capabilities_.sk_color_type;
 
-  GrBackendRenderTarget render_target(size_.width(), size_.height(), 0, 8,
-                                      framebuffer_info);
+  GrBackendRenderTarget render_target(size_.width(), size_.height(),
+                                      /*sampleCnt=*/0,
+                                      /*stencilBits=*/0, framebuffer_info);
   auto origin = (gl_surface_->GetOrigin() == gfx::SurfaceOrigin::kTopLeft)
                     ? kTopLeft_GrSurfaceOrigin
                     : kBottomLeft_GrSurfaceOrigin;