gles2_conform: Suppress warnings on Win/GN.

gpu/gles2_conform_support/BUILD.gn

Index: gpu/gles2_conform_support/BUILD.gn
diff --git a/gpu/gles2_conform_support/BUILD.gn b/gpu/gles2_conform_support/BUILD.gn
index 65dcb03b1c30c43d9f42634f8428345dddf1aeab..bb5ea2a9412698f120aa503e4604f8b2a2735894 100644
--- a/gpu/gles2_conform_support/BUILD.gn
+++ b/gpu/gles2_conform_support/BUILD.gn
@@ -147,9 +147,20 @@ if (internal_gles2_conform_tests) {
       ]
       configs -= [ "//build/config/win:nominmax" ]
       cflags = [
+        "/wd4013",  # undefined function, assuming extern returning int
         "/wd4018",  # signed/unsigned mismatch
+        "/wd4054",  # type cast from function pointer to data pointer
+        "/wd4057",  # non-constant aggregate initializer
         "/wd4101",  # unreferenced local variable
+        "/wd4189",  # local variable is initialized but not referenced
+        "/wd4204",  # non-constant aggregate initializer
+        "/wd4245",  # conversion between int/uint
+        "/wd4389",  # signed/unsigned comparison
+        "/wd4701",  # potentially uninitialized variable used
+        "/wd4703",  # potentially uninitialized pointer variable used
+        "/wd4706",  # assignment within conditional expression
         "/wd4715",  # not all control paths return a value
+        "/wd4716",  # function must return a value
         "/wd4267",  # size_t/unsigned int conversion
       ]
     }