Add check for highp support in Conic effect

This CL may not really be necessary since it seems that the Android Ones we have fall back to mediump when highp isn't supported.

FYI, for bits-of-precision/precision we have:

                        Low Med High Precision-Used
A1 (Cherry One - Mali 400) 10 10 0  Med        - conic looks bad
N5 (Adreno 330)            10 10 23 High       - conic looks bad!!!
N6 (Adreno 420)            10 10 23 High       - conic looks good
N7v2 (Adreno 320)          10 10 23 High       - conic looks bad!!!
N9 (K1)                    23 23 23 High       - looks good
N10 (Mail-604)             10 10 23 High       - looks good

I suspect derivative computation is broken on the Adreno 300s.

BUG=555779,skia:4668
TBR=bsalomon@google.com

Review URL: https://codereview.chromium.org/1513573009
diff --git a/include/gpu/GrCaps.h b/include/gpu/GrCaps.h
index 6d3b66a..3a6d27b 100644
--- a/include/gpu/GrCaps.h
+++ b/include/gpu/GrCaps.h
@@ -70,7 +70,7 @@
     * called.
     */
     const PrecisionInfo& getFloatShaderPrecisionInfo(GrShaderType shaderType,
-        GrSLPrecision precision) const {
+                                                     GrSLPrecision precision) const {
         return fFloatPrecisions[shaderType][precision];
     };