Add X-Client-Data to requests to googleweblight.com requests

Requests to googleweblight.com should receive an X-Client-Data header
containing the experimental group for the DataCompressionProxyLoFi
experiment.

Tested with desktop chrome which is part of DataCompressionProxyLoFi
experiment and the experiment ID is picked in
VariationsHttpHeaderProvider::UpdateVariationIDsHeaderValue

(To be landed in M49)

BUG=582600

Review URL: https://codereview.chromium.org/1662553002

Cr-Commit-Position: refs/heads/master@{#373658}

2 files changed, 14 insertions, 0 deletions

diff --git a/components/variations/net/variations_http_headers.cc b/components/variations/net/variations_http_headers.cc
index 2507cbb..48e84eb 100644
--- a/components/variations/net/variations_http_headers.cc
+++ b/components/variations/net/variations_http_headers.cc
@@ -31,6 +31,11 @@ const char* kSuffixesToSetHeadersFor[] = {
     ".ytimg.com",
 };
 
+// Exact hostnames in lowercase to set headers for.
+const char* kHostsToSetHeadersFor[] = {
+    "googleweblight.com",
+};
+
 const char kChromeUMAEnabled[] = "X-Chrome-UMA-Enabled";
 const char kClientData[] = "X-Client-Data";
 
@@ -91,6 +96,10 @@ bool ShouldAppendVariationHeaders(const GURL& url) {
                        base::CompareCase::INSENSITIVE_ASCII))
       return true;
   }
+  for (size_t i = 0; i < arraysize(kHostsToSetHeadersFor); ++i) {
+    if (base::LowerCaseEqualsASCII(host, kHostsToSetHeadersFor[i]))
+      return true;
+  }
 
   return google_util::IsYoutubeDomainUrl(url, google_util::ALLOW_SUBDOMAIN,
                                          google_util::ALLOW_NON_STANDARD_PORTS);
diff --git a/components/variations/net/variations_http_headers_unittest.cc b/components/variations/net/variations_http_headers_unittest.cc
index 6b06953..6421cc7 100644
--- a/components/variations/net/variations_http_headers_unittest.cc
+++ b/components/variations/net/variations_http_headers_unittest.cc
@@ -100,6 +100,11 @@ TEST(VariationsHttpHeadersTest, ShouldAppendHeaders) {
       {"http://ssl.gstatic.com", true},
       {"http://a.b.gstatic.com", true},
       {"http://a.b.ytimg.com", true},
+      {"http://googleweblight.com", true},
+      {"https://googleweblight.com", true},
+      {"http://wwwgoogleweblight.com", false},
+      {"http://www.googleweblight.com", false},
+      {"http://a.b.googleweblight.com", false},
   };
 
   for (size_t i = 0; i < arraysize(cases); ++i) {