Add support for GL_EXT_raster_multisample

src/gpu/GrCaps.cpp

Index: src/gpu/GrCaps.cpp
diff --git a/src/gpu/GrCaps.cpp b/src/gpu/GrCaps.cpp
index f4c64c3333258f293af520665e8143377ae3cfda..9a3e372633035a8d406059c16f8e027db0bce8c4 100644
--- a/src/gpu/GrCaps.cpp
+++ b/src/gpu/GrCaps.cpp
@@ -91,6 +91,7 @@ GrCaps::GrCaps(const GrContextOptions& options) {
     fOversizedStencilSupport = false;
     fTextureBarrierSupport = false;
     fUsesMixedSamples = false;
+    fRasterMultisampleSupport = false;
     fSupportsInstancedDraws = false;
     fFullClearIsFree = false;
     fMustClearUploadedBufferData = false;
@@ -106,6 +107,7 @@ GrCaps::GrCaps(const GrContextOptions& options) {
     fMaxTextureSize = 1;
     fMaxColorSampleCount = 0;
     fMaxStencilSampleCount = 0;
+    fMaxRasterSamples = 0;
 
     fSuppressPrints = options.fSuppressPrints;
     fImmediateFlush = options.fImmediateMode;
@@ -162,6 +164,7 @@ SkString GrCaps::dump() const {
     r.appendf("Oversized Stencil Support          : %s\n", gNY[fOversizedStencilSupport]);
     r.appendf("Texture Barrier Support            : %s\n", gNY[fTextureBarrierSupport]);
     r.appendf("Uses Mixed Samples                 : %s\n", gNY[fUsesMixedSamples]);
+    r.appendf("Raster Multisample Support         : %s\n", gNY[fRasterMultisampleSupport]);
     r.appendf("Supports instanced draws           : %s\n", gNY[fSupportsInstancedDraws]);
     r.appendf("Full screen clear is free          : %s\n", gNY[fFullClearIsFree]);
     r.appendf("Must clear buffer memory           : %s\n", gNY[fMustClearUploadedBufferData]);
@@ -178,6 +181,9 @@ SkString GrCaps::dump() const {
     r.appendf("Max Render Target Size             : %d\n", fMaxRenderTargetSize);
     r.appendf("Max Color Sample Count             : %d\n", fMaxColorSampleCount);
     r.appendf("Max Stencil Sample Count           : %d\n", fMaxStencilSampleCount);
+    if (this->rasterMultisampleSupport()) {
+        r.appendf("Max Raster Samples                 : %d\n", fMaxRasterSamples);
+    }
 
     static const char* kBlendEquationSupportNames[] = {
         "Basic",