Add a UMA stat to track if the Browser blacklist is Set on the Renderer

content/renderer/renderer_main.cc

Index: content/renderer/renderer_main.cc
diff --git a/content/renderer/renderer_main.cc b/content/renderer/renderer_main.cc
index 634684c58fe2fabf8f591cbaf00159ea557d58d0..35bb64cb725ae7d2830da2519234c022507ac43b 100644
--- a/content/renderer/renderer_main.cc
+++ b/content/renderer/renderer_main.cc
@@ -48,6 +48,10 @@
 #include "third_party/WebKit/public/web/WebView.h"
 #endif  // OS_MACOSX
 
+#if defined(OS_WIN)
+#include "chrome_elf/blacklist/blacklist.h"
+#endif  // OS_WIN
+
 #if defined(ENABLE_WEBRTC)
 #include "third_party/libjingle/overrides/init_webrtc.h"
 #endif
@@ -237,6 +241,13 @@ int RendererMain(const MainFunctionParams& parameters) {
 
     platform.RunSandboxTests(no_sandbox);
 
+#if defined(OS_WIN)
+    // TODO(csharp): Remove once the renderer is no longer getting
+    // patched this way.
+    if (blacklist::IsBlacklistInitialized())
+      UMA_HISTOGRAM_BOOLEAN("Blacklist.PatchedInRenderer", true);

[Alexei Svitkine (slow), 2014/02/06 22:12:29]

I would actually suggest:

UMA_HISTOGRAM_BOOLEAN("Blacklist.PatchedInRenderer",
blacklist::IsBlacklistInitialized());

That way, the histogram will tell you the ratio of the two, rather than the
absolute count which is hard to analyze without a baseline to compare to.

Unless of course your question is only "is this happening at all", in which case
the current way is fine.

[csharp, 2014/02/06 22:21:59]

We just want the raw numbers since ideally this should always be false (we only
want to blacklist the browser process).

+#endif
+
     startup_timer.Stop();  // End of Startup Time Measurement.
 
     if (run_loop) {