Fix uninitialized ConfigSorter read.

We were not initializaing the mWant* members to false.

BUG=468638

Change-Id: I90ef131c930c6f9c31e9bc9cec951c1f91816eb0
Reviewed-on: https://chromium-review.googlesource.com/261047
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>
diff --git a/src/libANGLE/Config.cpp b/src/libANGLE/Config.cpp
index ceb53db..1b1fc50 100644
--- a/src/libANGLE/Config.cpp
+++ b/src/libANGLE/Config.cpp
@@ -108,6 +108,11 @@
 {
   public:
     explicit ConfigSorter(const AttributeMap &attributeMap)
+        : mWantRed(false),
+          mWantGreen(false),
+          mWantBlue(false),
+          mWantAlpha(false),
+          mWantLuminance(false)
     {
         scanForWantedComponents(attributeMap);
     }