[foozzie] Suppress Math.pow precision

BUG=chromium:693426
NOTRY=true
TBR=mstarzinger@chromium.org,jarin@chromium.org

Change-Id: If9e5611566660455543044ddff60acda1ee153ba
Reviewed-on: https://chromium-review.googlesource.com/446347Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43441}

tools/foozzie/v8_suppressions.js

@@ -9,12 +9,25 @@
 
 // Suppress http://crbug.com/662429
 (function () {
-  var __real_Math_pow = Math.pow
+  var oldMathPow = Math.pow
   Math.pow = function(a, b){
     if (b < 0) {
       return 0.000017;
     } else {
-      return __real_Math_pow(a, b);
+      return oldMathPow(a, b);
     }
   }
 })();
+
+// Suppress http://crbug.com/693426
+(function () {
+  var oldMathPow = Math.pow
+  Math.pow = function(a, b){
+    var s = "" + oldMathPow(a, b)
+    // Low tech precision mock. Limit digits in string representation.
+    // The phrases Infinity and NaN don't match the split("e").
+    s = s.split("e");
+    s[0] = s[0].substr(0, 17);
+    return parseFloat(s.join("e"));
+  }
+})();