Create the crash key registration system and register some Mac-specific keys.

chrome/common/crash_keys.cc

Index: chrome/common/crash_keys.cc
diff --git a/chrome/common/crash_keys.cc b/chrome/common/crash_keys.cc
index 55b0864c40e0fab3b81d8c0a2b9e7f35d07cd458..9290c4bf7f643b4a97fd8e69a4b266c5da020a5d 100644
--- a/chrome/common/crash_keys.cc
+++ b/chrome/common/crash_keys.cc
@@ -6,6 +6,34 @@
 
 namespace crash_keys {
 
+// TODO(rsesek): This is true on Mac and Linux but not Windows.
+static const size_t kSingleChunkLength = 255;

[Scott Hess - ex-Googler, 2013/01/10 18:43:54]

My max_length comment was that if all of the max_length are going to be
kSingleChunkLength, then you might as well pass it to InitCrashKeys(), rather
than putting it in every element of keys[].  I can't really think of a reason to
ever have it be something other than "maximum per-key length the system allows"
for this.

Also, seeing all of those 1's makes me ponder whether the signal for "unchunked"
should be 0, which would allow the stupid edge case of just having a single
chunk.  Like I said, stupid edge case, even thinking about it makes me short of
breath.

[Robert Sesek, 2013/01/10 19:46:56]

Ah, I like it. Done.
Hmmm. I see why that could work, but I think that just creates more
complication.

[Scott Hess - ex-Googler, 2013/01/10 20:16:28]

Yeah.  I think it would be more justified if this were a heavily-used API of
some sort, but here if the problem ever came up we could just fix it and not
worry about tracking down a bunch of developers and retraining them.

+
+size_t RegisterChromeCrashKeys() {
+  base::debug::CrashKey keys[] = {
+#if defined(OS_MACOSX)
+    { mac::kFirstNSException, 1, kSingleChunkLength },
+    { mac::kFirstNSExceptionTrace, 1, kSingleChunkLength },
+    { mac::kLastNSException, 1, kSingleChunkLength },
+    { mac::kLastNSExceptionTrace, 1, kSingleChunkLength },
+    { mac::kNSException, 1, kSingleChunkLength },
+    { mac::kSendAction, 1, kSingleChunkLength },
+    { mac::kZombie, 1, kSingleChunkLength },
+    { mac::kZombieTrace, 1, kSingleChunkLength },
+    // content/:
+    { "channel_error_bt", 1, kSingleChunkLength },
+    { "remove_route_bt", 1, kSingleChunkLength },
+    { "rwhvm_window", 1, kSingleChunkLength },
+    // media/:
+    { "VideoCaptureDeviceQTKit", 1, kSingleChunkLength },
+#endif
+  };
+
+  return base::debug::InitCrashKeys(keys, arraysize(keys));
+}
+
+// Crash Key Name Constants ////////////////////////////////////////////////////
+
 namespace mac {
 
 const char kFirstNSException[] = "firstexception";