Relax passing criteria for eye dropper test.

This CL changes the passing criteria for the eye dropper test to
account for monitors calibrated differently.

Bug: 1160234
Change-Id: If3444bd1621e76ffa42549e1bafb67879a522787
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2616082
Commit-Queue: Ionel Popescu <iopopesc@microsoft.com>
Reviewed-by: Mason Freed <masonfreed@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841268}

third_party/blink/manual_tests/forms/eye-dropper.html

@@ -62,7 +62,13 @@
     document.getElementById("color").addEventListener("input", function(e) {
       let entry = log("color updated to " + e.target.value + " expected: #ff0000");
       let span = document.createElement("span");
-      if (e.target.value == "#ff0000") {
+
+      let red = parseInt(e.target.value.substring(1, 3), 16);
+      let green = parseInt(e.target.value.substring(3, 5), 16);
+      let blue = parseInt(e.target.value.substring(5, 7), 16);
+      // Make sure the selected color is close to pure red (#FF0000), but allow
+      // some deviation due to monitor color calibration.
+      if (red >= 0xC0 && green <= 0x3F && blue <= 0x3F) {
         span.innerText = "PASS ";
         span.classList.add("passed");
       } else {