Validate that VAO functions are present in ES2 interfaces and add bit to caps indicating VAO suppor…

src/gpu/gl/GrGLCaps.cpp

Index: src/gpu/gl/GrGLCaps.cpp
===================================================================
--- src/gpu/gl/GrGLCaps.cpp	(revision 7958)
+++ src/gpu/gl/GrGLCaps.cpp	(working copy)
@@ -37,6 +37,7 @@
     fImagingSupport = false;
     fTwoFormatLimit = false;
     fFragCoordsConventionSupport = false;
+    fVertexArrayObjectSupport = false;
     fUseNonVBOVertexAndIndexDynamicData = false;
     fIsCoreProfile = false;
 }
@@ -69,6 +70,7 @@
     fImagingSupport = caps.fImagingSupport;
     fTwoFormatLimit = caps.fTwoFormatLimit;
     fFragCoordsConventionSupport = caps.fFragCoordsConventionSupport;
+    fVertexArrayObjectSupport = caps.fVertexArrayObjectSupport;
     fUseNonVBOVertexAndIndexDynamicData = caps.fUseNonVBOVertexAndIndexDynamicData;
     fIsCoreProfile = caps.fIsCoreProfile;
 
@@ -185,6 +187,13 @@
         fIsCoreProfile = SkToBool(profileMask & GR_GL_CONTEXT_CORE_PROFILE_BIT);
     }
 
+    if (kDesktop_GrGLBinding == binding) {
+        fVertexArrayObjectSupport = version >= GR_GL_VER(3, 0) ||
+                                    ctxInfo.hasExtension("GL_ARB_vertex_array_object");
+    } else {
+        fVertexArrayObjectSupport = ctxInfo.hasExtension("GL_OES_vertex_array_object");
+    }
+
     this->initFSAASupport(ctxInfo, gli);
     this->initStencilFormats(ctxInfo);
 }