Navigation transitions (web to native app): Pass data after starting provisional load (Chrome side)

content/browser/transition_request_manager.h

 // Copyright 2014 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.
 
 #ifndef CONTENT_BROWSER_TRANSITION_REQUEST_MANAGER_H_
 #define CONTENT_BROWSER_TRANSITION_REQUEST_MANAGER_H_
 
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
+#include "content/public/common/transition_element.h"
 #include "ui/gfx/geometry/rect.h"
 #include "url/gurl.h"
 
 template <typename T>
 struct DefaultSingletonTraits;
 
 namespace net {
 class HttpResponseHeaders;
 }
 class GURL;
 
 namespace content {
 
 // This struct passes data about an imminent transition between threads.
 struct TransitionLayerData {
   CONTENT_EXPORT TransitionLayerData();
   CONTENT_EXPORT ~TransitionLayerData();
 
   std::string markup;
   std::string css_selector;
-  std::vector<std::string> names;
-  std::vector<gfx::Rect> rects;
+  std::vector<TransitionElement> elements;
   scoped_refptr<net::HttpResponseHeaders> response_headers;
   GURL request_url;
 };
 
 // TransitionRequestManager is used to handle bookkeeping for transition
 // requests and responses.
 //
 // TransitionRequestManager is a singleton and should only be accessed on the IO
 // thread.
 //
 class TransitionRequestManager {
  public:
   // Returns the singleton instance.
   CONTENT_EXPORT static TransitionRequestManager* GetInstance();
 
   // Parses out any transition-entering-stylesheet link headers from the
   // response headers.
   CONTENT_EXPORT static void ParseTransitionStylesheetsFromHeaders(
       const scoped_refptr<net::HttpResponseHeaders>& headers,
       std::vector<GURL>& entering_stylesheets,
       const GURL& resolve_address);
 
-  // Returns whether the RenderFrameHost specified by the given IDs currently
-  // has any pending transition request data. If so, we will have to delay the
-  // response until the embedder resumes the request.
-  CONTENT_EXPORT bool HasPendingTransitionRequest(
+  // Get pending transition request data from RenderFrameHost specified by the
+  // given IDs and return true if the data exists. For web to web transition, we
+  // will have to delay the response until the embedder resumes the request if
+  // the data exists.
+  CONTENT_EXPORT bool GetPendingTransitionRequest(
       int render_process_id,
       int render_frame_id,
       const GURL& request_url,
       TransitionLayerData* transition_data);
 
   // Adds pending request data for a transition navigation for the
   // RenderFrameHost specified by the given IDs.
   CONTENT_EXPORT void AddPendingTransitionRequestData(
       int render_process_id,
       int render_frame_id,
       const std::string& allowed_destination_host_pattern,
       const std::string& css_selector,
       const std::string& markup,
-      const std::vector<std::string>& names,
-      const std::vector<gfx::Rect>& rects);
+      const std::vector<TransitionElement>& elements);
   CONTENT_EXPORT void AddPendingTransitionRequestDataForTesting(
       int render_process_id,
       int render_frame_id);
 
   CONTENT_EXPORT void ClearPendingTransitionRequestData(int render_process_id,
                                                         int render_frame_id);
 
+  // The maximum number of elements is meant to avoid passing arbitrarily large
+  // amount of objects across the IPC boundary.
+  static const int kMaxNumOfElements = 1024;
+
  private:
   class TransitionRequestData {
    public:
     TransitionRequestData();
     ~TransitionRequestData();
     void AddEntry(const std::string& allowed_destination_host_pattern,
                   const std::string& selector,
                   const std::string& markup,
-                  const std::vector<std::string>& names,
-                  const std::vector<gfx::Rect>& rects);
+                  const std::vector<TransitionElement>& elements);
     bool FindEntry(const GURL& request_url,
                     TransitionLayerData* transition_data);
 
    private:
     struct AllowedEntry {
       // These strings could have originated from a compromised renderer,
       // and should not be trusted or assumed safe. They are only used within
       // a sandboxed iframe with scripts disabled.
       std::string allowed_destination_host_pattern;
       std::string css_selector;
       std::string markup;
-      std::vector<std::string> names;
-      std::vector<gfx::Rect> rects;
+      std::vector<TransitionElement> elements;
 
       AllowedEntry(const std::string& allowed_destination_host_pattern,
                    const std::string& css_selector,
                    const std::string& markup,
-                   const std::vector<std::string>& names,
-                   const std::vector<gfx::Rect>& rects);
+                   const std::vector<TransitionElement>& elements);
       ~AllowedEntry();
     };
     std::vector<AllowedEntry> allowed_entries_;
   };
 
   friend struct DefaultSingletonTraits<TransitionRequestManager>;
   typedef std::map<std::pair<int, int>, TransitionRequestData>
       RenderFrameRequestDataMap;
 
   TransitionRequestManager();
   ~TransitionRequestManager();
 
   // Map of (render_process_host_id, render_frame_id) pairs of all
   // RenderFrameHosts that have pending cross-site requests and their data.
   // Used to pass information to the CrossSiteResourceHandler without doing a
   // round-trip between IO->UI->IO threads.
   RenderFrameRequestDataMap pending_transition_frames_;
 
   DISALLOW_COPY_AND_ASSIGN(TransitionRequestManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_TRANSITION_REQUEST_MANAGER_H_