add drawArraysInstanced to caps

src/gpu/gl/GrGLCaps.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrGLCaps.h"
 
@@ skipping 430 matching lines @@
             ctxInfo.hasExtension("GL_ARB_framebuffer_object")) {
             fOversizedStencilSupport = true;
         } else {
             SkASSERT(ctxInfo.hasExtension("GL_EXT_framebuffer_object"));
         }
     } else {
         // ES 3.0 supports mixed size FBO attachments, 2.0 does not.
         fOversizedStencilSupport = ctxInfo.version() >= GR_GL_VER(3, 0);
     }
 
+    if (kGL_GrGLStandard == standard) {
+        // 3.1 has draw_instanced but not instanced_arrays, for the time being we only care about
+        // instanced arrays, but we could make this more granular if we wanted
+        fSupportsInstancedDraws =
+                version >= GR_GL_VER(3, 2) ||
+                (ctxInfo.hasExtension("GL_ARB_draw_instanced") &&
+                 ctxInfo.hasExtension("GL_ARB_instanced_arrays"));
+    } else {
+        fSupportsInstancedDraws =
+                version >= GR_GL_VER(3, 0) ||
+                (ctxInfo.hasExtension("GL_EXT_draw_instanced") &&
+                 ctxInfo.hasExtension("GL_EXT_instanced_arrays"));
+    }
+
     this->initConfigTexturableTable(ctxInfo, gli);
     this->initConfigRenderableTable(ctxInfo);
     this->initShaderPrecisionTable(ctxInfo, gli, glslCaps);
 
     this->applyOptionsOverrides(contextOptions);
     glslCaps->applyOptionsOverrides(contextOptions);
 }
 
 void GrGLCaps::initConfigRenderableTable(const GrGLContextInfo& ctxInfo) {
     // OpenGL < 3.0
@@ skipping 697 matching lines @@
         for (int p = 0; p < kGrSLPrecisionCount; ++p) {
             glslCaps->fFloatPrecisions[kGeometry_GrShaderType][p] = 
                                                glslCaps->fFloatPrecisions[kVertex_GrShaderType][p];
         }
     }
 }