Add core plumbing for Instant Extended work

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 eda66b334eb9ae10da12bec84c65276edf8ab0cc..b25d9a28beef409b44b42f28cfb02b6e44fffbd0 100644
--- a/chrome/browser/google/google_util.cc
+++ b/chrome/browser/google/google_util.cc
@@ -18,6 +18,7 @@
 #include "chrome/common/net/url_util.h"
 #include "chrome/installer/util/google_update_settings.h"
 #include "googleurl/src/gurl.h"
+#include "googleurl/src/url_parse.h"
 #include "net/base/registry_controlled_domain.h"
 
 #if defined(OS_MACOSX)
@@ -203,6 +204,26 @@ bool IsGoogleSearchUrl(const std::string& url) {
       (!is_home_page_base && HasQueryParameter(query));
 }
 
+bool IsInstantExtendedAPIGoogleSearchUrl(const std::string& url) {
+  if (!IsGoogleSearchUrl(url))
+    return false;
+
+  const std::string embedded_search_key = "espv";
+
+  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 |embedded_search_key| and the value is not 0 this
+    // is an Instant Extended API Google search URL.
+    if (url.substr(key.begin, key.len) == embedded_search_key) {
+      return value.is_nonempty() && url.substr(value.begin, value.len) != "0";
+    }
+  }
+  return false;
+}
+
 bool IsOrganic(const std::string& brand) {
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   if (command_line.HasSwitch(switches::kOrganicInstall))