added sksl support for integerSupport cap

Bug: skia:
Change-Id: I7e33af9b845db3f862a3a21cba7f2d56e8ea2909
Reviewed-on: https://skia-review.googlesource.com/24323
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>

src/sksl/SkSLIRGenerator.cpp

@@ -141,6 +141,7 @@ static void fill_caps(const SKSL_CAPS_CLASS& caps,
     CAP(mustDeclareFragmentShaderOutput);
     CAP(canUseAnyFunctionInShader);
     CAP(floatPrecisionVaries);
+    CAP(integerSupport);
 #undef CAP
 }
 

src/sksl/SkSLUtil.h

@@ -139,6 +139,10 @@ public:
         return false;
     }
 
+    bool integerSupport() const {
+        return false;
+    }
+
     const char* shaderDerivativeExtensionString() const {
         return nullptr;
     }