Accept processor test seed from command line

Also adds support for uint32_t CLI flags, parsed as octal, hex, or dec.

Bug: skia:
Change-Id: I87112beb6506a65d6f541c7ca4cfb38641d55aa5
Reviewed-on: https://skia-review.googlesource.com/158040
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
diff --git a/tools/flags/SkCommandLineFlags.cpp b/tools/flags/SkCommandLineFlags.cpp
index 3924812..62625e1 100644
--- a/tools/flags/SkCommandLineFlags.cpp
+++ b/tools/flags/SkCommandLineFlags.cpp
@@ -328,6 +328,10 @@
                             i++;
                             flag->setInt(atoi(argv[i]));
                             break;
+                        case SkFlagInfo::kUint_FlagType:
+                            i++;
+                            flag->setUint(strtoul(argv[i], nullptr, 0));
+                            break;
                         case SkFlagInfo::kDouble_FlagType:
                             i++;
                             flag->setDouble(atof(argv[i]));