[SH] Add sites to blocklist

This adds a handful of sites to the Shared Highlighting blocklist. It
also strips m. from hosts, similar to what we already do for www.

Bug: 1157981
Change-Id: If907ba6bd79529e98a634918e47a21dd1f2730cb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2629571Reviewed-by: Sebastien Lalancette <seblalancette@chromium.org>
Commit-Queue: Tommy Martino <tmartino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843753}

components/shared_highlighting/core/common/disabled_sites.cc

@@ -19,13 +19,23 @@ bool ShouldOfferLinkToText(const GURL& url) {
     // against the RE stored in the value. For example, {"foo.com", ".*"} means
     // any page on the foo.com domain.
     const static std::map<std::string, std::string> kBlocklist = {
-        {"youtube.com", ".*"},
+        {"facebook.com", ".*"},
         // TODO(crbug.com/1157981): special case this to cover other Google TLDs
-        {"google.com", "^\\/amp\\/.*"}};
+        {"google.com", "^\\/amp\\/.*"},
+        {"instagram.com", ".*"},
+        {"reddit.com", ".*"},
+        {"web.whatsapp.com", ".*"},
+        {"youtube.com", ".*"},
+
+    };
+
+    std::string domain = url.host();
+    if (domain.compare(0, 4, "www.") == 0) {
+      domain = domain.substr(4);
+    } else if (domain.compare(0, 2, "m.") == 0) {
+      domain = domain.substr(2);
+    }
 
-    const std::string domain = url.host().compare(0, 4, "www.") == 0
-                                   ? url.host().substr(4)
-                                   : url.host();
     auto it = kBlocklist.find(domain);
     if (it != kBlocklist.end()) {
       return !re2::RE2::FullMatch(url.path(), it->second);

components/shared_highlighting/core/common/disabled_sites_unittest.cc

@@ -15,6 +15,8 @@ namespace {
 TEST(DisabledSitesTest, AllPaths) {
   EXPECT_FALSE(ShouldOfferLinkToText(GURL("https://www.youtube.com")));
   EXPECT_FALSE(ShouldOfferLinkToText(GURL("https://www.youtube.com/somepage")));
+  EXPECT_FALSE(ShouldOfferLinkToText(GURL("https://m.youtube.com")));
+  EXPECT_FALSE(ShouldOfferLinkToText(GURL("https://m.youtube.com/somepage")));
   EXPECT_FALSE(ShouldOfferLinkToText(GURL("https://youtube.com")));
   EXPECT_FALSE(ShouldOfferLinkToText(GURL("https://youtube.com/somepage")));
 }