Implement support for mixed sampled render targets

Adds a new FBO type kStencil_MSFBOType that is selected whenever
NV_framebuffer_mixed_samples extension is available.  In this new
FBO type a non-msaa color buffer is created with a multisampled
stencil buffer attachment.

Replaces numSamples() with separate numColorSamples and numStencilSamples
methods in RenderTarget.

In mixed samples mode non-MSAA codepaths are used to draw simple shapes,
while NVPR-rendered paths and text are rendered with a multisampled
stencil.

BUG=skia:3177

Review URL: https://codereview.chromium.org/1001503002

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gpu/GrPipelineBuilder.cpp b/src/gpu/GrPipelineBuilder.cpp
index 26422fd547..b31d105963 100644
--- a/src/gpu/GrPipelineBuilder.cpp
+++ b/src/gpu/GrPipelineBuilder.cpp
@@ -75,7 +75,7 @@ void GrPipelineBuilder::setFromPaint(const GrPaint& paint, GrRenderTarget* rt, c
 
     this->setState(GrPipelineBuilder::kDither_Flag, paint.isDither());
     this->setState(GrPipelineBuilder::kHWAntialias_Flag,
-                   rt->isMultisampled() && paint.isAntiAlias());
+                   rt->isUnifiedMultisampled() && paint.isAntiAlias());
 
     fColorProcInfoValid = false;
     fCoverageProcInfoValid = false;