added support for PLS path rendering

src/gpu/gl/GrGLCaps.cpp

Index: src/gpu/gl/GrGLCaps.cpp
diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index 9a2a5acad9fe9142229cf6d7d76fa563cb864d95..ae6e6132b1b8e80b2c4834104131c1199561c0be 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -281,6 +281,17 @@ void GrGLCaps::init(const GrContextOptions& contextOptions,
             ctxInfo.hasExtension("GL_OES_standard_derivatives");
     }
 
+    if (ctxInfo.hasExtension("GL_EXT_shader_pixel_local_storage")) {
+        #define GL_MAX_SHADER_PIXEL_LOCAL_STORAGE_FAST_SIZE_EXT 0x8F63
+        GR_GL_GetIntegerv(gli, GL_MAX_SHADER_PIXEL_LOCAL_STORAGE_FAST_SIZE_EXT, 
+                          &glslCaps->fPixelLocalStorageSize);
+        glslCaps->fPLSPathRenderingSupport = glslCaps->fFBFetchSupport;
+    }
+    else {
+        glslCaps->fPixelLocalStorageSize = 0;
+        glslCaps->fPLSPathRenderingSupport = false;
+    }
+
     /**************************************************************************
      * GrCaps fields
      **************************************************************************/
@@ -527,7 +538,6 @@ void GrGLCaps::initGLSL(const GrGLContextInfo& ctxInfo) {
 
     GrGLSLCaps* glslCaps = static_cast<GrGLSLCaps*>(fShaderCaps.get());
     glslCaps->fGLSLGeneration = ctxInfo.glslGeneration();
-
     if (kGLES_GrGLStandard == standard) {
         if (ctxInfo.hasExtension("GL_EXT_shader_framebuffer_fetch")) {
             glslCaps->fFBFetchNeedsCustomOutput = (version >= GR_GL_VER(3, 0));