[Offline Prefetch] Send GeneratePageBundleRequest to the server

components/offline_pages/core/prefetch/proto/offline_pages.proto

Index: components/offline_pages/core/prefetch/proto/offline_pages.proto
diff --git a/components/offline_pages/core/prefetch/proto/offline_pages.proto b/components/offline_pages/core/prefetch/proto/offline_pages.proto
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+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+syntax = "proto3";
+option optimize_for = LITE_RUNTIME;
+
+package offline_pages.proto;
+
+import "status.proto";
+import "timestamp.proto";
+
+// Type of transformation applied to a web page.
+enum Transformation {
+  // Transformation not specified.
+  TRANSFORMATION_UNSPECIFIED = 0;
+  // Minimal transformation required to provide an offline-accessible web page.
+  NO_TRANSFORMATION = 1;
+}
+
+// Page package format.
+enum OutputFormat {
+  // Format not specified.
+  FORMAT_UNSPECIFIED = 0;
+  // An MHTML archive containing a single web page.
+  FORMAT_MHTML = 1;
+}
+
+// Response to the GeneratePageBundle request.
+message PageBundle {
+  // The list of archives in the bundle. The distribution of pages into archives
+  // is arbitrary.
+  repeated Archive archives = 1;
+}
+
+// A resource containing one or more serialized offline pages.
+message Archive {
+  // Information about the individual page(s) used to create the Archive.
+  // There will be one PageInfo message for every page in the archive, including
+  // those that encountered an error or were elided due to size considerations.
+  repeated PageInfo page_infos = 1;
+  // Format of the body.
+  OutputFormat output_format = 2;
+  // Resource name for the body which can be read via the ByteStream API.
+  // This resource will remain available for a minimum of 24 hours after the
+  // GeneratePageBundle request.
+  string body_name = 3;
+  // Length of the body in bytes.
+  int64 body_length = 4;
+}
+
+// Information about a single returned offline page.
+message PageInfo {
+  // The URL of the page that was rendered.
+  string url = 1;
+  // The final URL after redirects. Empty if the final URL is url.
+  string redirect_url = 2;
+  // Status of the render attempt. If status.code != OK, fields below this will
+  // be unset. If the operation is still running, status is NotFound to
+  // indicate the page is still being processed.
+  // If the page was not returned due to bundle size limits, status is
+  // FailedPrecondition. If the page failed to render for any other reason,
+  // status is Unknown.
+  Status status = 3;
+  // Transformation that was applied to the page.
+  Transformation transformation = 4;
+  // Time the page was rendered.
+  Timestamp render_time = 5;
+}
+
+// Request to return a list of pages in a format suitable for offline viewing.
+message GeneratePageBundleRequest {
+  // The client's browser's user agent string.
+  string user_agent = 1;
+  // Preferred browser language(s) as defined by
+  // [IETF BCP 47](https://tools.ietf.org/html/bcp47).
+  repeated string browser_languages = 2;
+  // Desired format of the web page archive(s).
+  OutputFormat output_format = 3;
+  // Maximum size of the generated body. If all pages' output would exceed this
+  // size, only the first N pages are returned.
+  int64 max_bundle_size_bytes = 4;
+  // The GCM registration ID that can be used to inform the client
+  // of LRO completion.
+  string gcm_registration_id = 5;
+  // List of individual page requests, in order of priority. At most 100 pages
+  // may be requested at a time.
+  repeated PageParameters pages = 6;
+}
+
+// Request a set of pages to be returned in a format suitable for offline
+// viewing.
+message PageParameters {
+  // URL of the web page to return.
+  string url = 1;
+  // Transformation to apply. Must not be TRANSFORMATION_UNSPECIFIED.
+  Transformation transformation = 2;
+}