Update hints.proto to include new URL-keyed hints API.

This change adds support for URL-keyed requests and hints to be
provided by the optimization guide.

Bug: 1036490
Change-Id: Ic261c776a9b8ec54158faff2ac90be81d5f8cd07
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1979350Reviewed-by: Michael Crouse <mcrouse@chromium.org>
Commit-Queue: Sophie Chang <sophiechang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727779}

components/optimization_guide/proto/hints.proto

@@ -27,12 +27,21 @@ message HostInfo {
   optional MatchedHintInfo matched_hint = 2;
 }
 
+// Information about a URL to request hints for.
+message UrlInfo {
+  // The URL that the client is requesting information for.
+  optional string url = 1;
+}
+
 // Request to return a set of hints that guide what optimizations to perform
 // on those hosts.
 message GetHintsRequest {
   // Information about the set of hosts to retrieve hints for.
   repeated HostInfo hosts = 1;
 
+  // Information about the set of URLs to retrieve hints for.
+  repeated UrlInfo urls = 4;
+
   // The set of optimization types that the requesting client can support
   // and perform.
   //
@@ -124,6 +133,11 @@ enum KeyRepresentation {
   // Example: A host suffix of example.com would match pages with host
   // sports.example.com, but not fooexample.com.
   HOST_SUFFIX = 1;
+  // The full URL to match.
+  //
+  // This will be an exact match of a page load URL, including query params and
+  // fragments.
+  FULL_URL = 2;
 }
 
 message Optimization {
@@ -206,6 +220,8 @@ message Hint {
   // It is expected that this version be sent along with subsequent requests
   // for hosts that match this hint.
   optional string version = 5;
+  // The maximum duration for which the hint should be used for.
+  optional Duration max_cache_duration = 6;
 }
 
 // Configuration and data for a Bloom filter.