Added a histogram to track number of http/https resources.

content/browser/renderer_host/duplicate_content_resource_handler.cc

Index: content/browser/renderer_host/duplicate_content_resource_handler.cc
===================================================================
--- content/browser/renderer_host/duplicate_content_resource_handler.cc	(revision 150428)
+++ content/browser/renderer_host/duplicate_content_resource_handler.cc	(working copy)
@@ -92,6 +92,10 @@
   MH_UINT32 contents_hash = PMurHash32_Result(pmurhash_ph1_,
                                               pmurhash_pcarry_, bytes_read_);
 
+  bool is_http_or_https = request_->url().SchemeIs("http") ||

[darin (slow to review), 2012/08/11 06:18:36]

weren't you going to modify this to stop recording metrics for non-http(s) URLs?
 or otherwise put a cap on the memory leak?

+                          request_->url().SchemeIs("https");
+  UMA_HISTOGRAM_BOOLEAN("Duplicate.IsHttpOrHttps", is_http_or_https);
+
   // Combine the contents_hash with the url, so we can test if future content
   // identical resources have the same original url or not.
   MH_UINT32 hashed_with_url;
@@ -117,6 +121,8 @@
   UMA_HISTOGRAM_BOOLEAN("Duplicate.Hits", did_match_contents);
   UMA_HISTOGRAM_BOOLEAN("Duplicate.HitsSameUrl",
                          did_match_contents && did_match_contents_and_url);
+  UMA_HISTOGRAM_ENUMERATION("Duplicate.ResourceType.All", resource_type_,

[darin (slow to review), 2012/08/11 06:18:36]

this was part of the other CL, right?

+                             ResourceType::LAST_TYPE);
   if (did_match_contents && !did_match_contents_and_url) {
     content_and_url_matches->insert(hashed_with_url);
     UMA_HISTOGRAM_CUSTOM_COUNTS("Duplicate.Size.HashHitUrlMiss", bytes_read_,