A simple version of search term replacement for testing .

chrome/browser/google/google_util.cc

Index: chrome/browser/google/google_util.cc
diff --git a/chrome/browser/google/google_util.cc b/chrome/browser/google/google_util.cc
index 1e5945984b18014f8518b5fbef89f64b43489b5e..c54980dd55380aa29c74e9694b75c1cb5796363a 100644
--- a/chrome/browser/google/google_util.cc
+++ b/chrome/browser/google/google_util.cc
@@ -20,6 +20,7 @@
 #include "chrome/installer/util/google_update_settings.h"
 #include "googleurl/src/gurl.h"
 #include "googleurl/src/url_parse.h"
+#include "net/base/escape.h"
 #include "net/base/registry_controlled_domains/registry_controlled_domain.h"
 
 #if defined(OS_MACOSX)
@@ -137,6 +138,35 @@ bool GetReactivationBrand(std::string* brand) {
 
 #endif
 
+string16 GetSearchTermsFromGoogleSearchURL(const std::string& url) {
+  if (!IsInstantExtendedAPIGoogleSearchUrl(url))
+    return string16();
+
+  const std::string query_key = "q";
+
+  url_parse::Parsed parsed_url;
+  url_parse::ParseStandardURL(url.c_str(), url.length(), &parsed_url);
+  url_parse::Component key, value;
+  while (url_parse::ExtractQueryKeyValue(
+      url.c_str(), &parsed_url.query, &key, &value)) {
+    // If the parameter key is |query_key| and the value is not empty, those are
+    // the search terms.
+    if (!url.compare(key.begin, key.len, query_key)) {
+      if (value.is_nonempty()) {
+        std::string value_str = url.substr(value.begin, value.len);
+        return net::UnescapeAndDecodeUTF8URLComponent(
+            value_str,
+            net::UnescapeRule::SPACES |
+                net::UnescapeRule::URL_SPECIAL_CHARS |
+                net::UnescapeRule::REPLACE_PLUS_WITH_SPACE,
+            NULL);
+      }
+      break;
+    }
+  }
+  return string16();
+}
+
 bool IsGoogleDomainUrl(const std::string& url, SubdomainPermission permission) {
   GURL original_url(url);
   return original_url.is_valid() && original_url.port().empty() &&