Implement a shell of FindRequestManager, and hook it up to WebContentsImpl.

content/browser/find_request_manager.cc

+// Copyright 2016 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.
+
+#include "content/browser/find_request_manager.h"
+
+#include "content/browser/frame_host/render_frame_host_impl.h"
+#include "content/browser/web_contents/web_contents_impl.h"
+#include "content/common/frame_messages.h"
+#include "content/common/input_messages.h"
+
+namespace content {
+
+FindRequestManager::FindRequestManager(WebContentsImpl* web_contents)
+    : contents_(web_contents),
+      current_session_id_(kInvalidId),
+      number_of_matches_(0),
+      active_match_ordinal_(0) {}
+
+FindRequestManager::~FindRequestManager() {}
+
+void FindRequestManager::Find(int request_id,
+                              const base::string16& search_text,
+                              const blink::WebFindOptions& options) {
+  // Every find request must have a unique ID, and these IDs must strictly
+  // increase so that newer requests always have greater IDs than older
+  // requests.
+  DCHECK_GT(request_id, current_request_.id);
+  DCHECK_GT(request_id, current_session_id_);
+
+  FindRequest request(request_id, search_text, options);
+
+  if (options.findNext) {
+    // This is a find next operation.
+
+    // This implies that there is an ongoing find session with the same search
+    // text.
+    DCHECK_GE(current_session_id_, 0);
+    DCHECK_EQ(request.search_text, current_request_.search_text);
+  } else {
+    // This is an initial find operation.
+    Reset(request);
+  }
+
+  SendFindIPC(request, contents_->GetMainFrame());
+}
+
+void FindRequestManager::StopFinding(StopFindAction action) {
+  SendStopFindingIPC(action, contents_->GetMainFrame());
+  current_session_id_ = kInvalidId;
+}
+
+void FindRequestManager::OnFindReply(RenderFrameHost* rfh,
+                                     int request_id,
+                                     int number_of_matches,
+                                     const gfx::Rect& selection_rect,
+                                     int active_match_ordinal,
+                                     bool final_update) {
+  // Ignore stale replies from abandoned find sessions.
+  if (current_session_id_ == kInvalidId || request_id < current_session_id_)
+    return;
+
+  // Update the stored results.
+  number_of_matches_ = number_of_matches;
+  selection_rect_ = selection_rect;
+  active_match_ordinal_ = active_match_ordinal;
+
+  NotifyFindReply(request_id, final_update);
+}
+
+#if defined(OS_ANDROID)
+void FindRequestManager::ActivateNearestFindResult(float x,
+                                                   float y) {
+  if (current_session_id_ == kInvalidId)
+    return;
+
+  auto rfh = contents_->GetMainFrame();
+  rfh->Send(new InputMsg_ActivateNearestFindResult(
+      rfh->GetRoutingID(), current_session_id_, x, y));
+}
+
+void FindRequestManager::RequestFindMatchRects(int current_version) {
+  match_rects_.request_version = current_version;
+  SendFindMatchRectsIPC(contents_->GetMainFrame());
+}
+
+void FindRequestManager::OnFindMatchRectsReply(
+    RenderFrameHost* rfh,
+    int version,
+    const std::vector<gfx::RectF>& rects,
+    const gfx::RectF& active_rect) {
+  contents_->NotifyFindMatchRectsReply(version, rects, active_rect);
+}
+#endif
+
+void FindRequestManager::Reset(const FindRequest& initial_request) {
+  current_session_id_ = initial_request.id;
+  current_request_ = initial_request;
+  number_of_matches_ = 0;
+  active_match_ordinal_ = 0;
+  selection_rect_ = gfx::Rect();
+#if defined(OS_ANDROID)
+  match_rects_ = FindMatchRectsState();
+#endif
+}
+
+void FindRequestManager::SendFindIPC(const FindRequest& request,
+                                     RenderFrameHost* rfh) {
+  rfh->Send(new FrameMsg_Find(rfh->GetRoutingID(), request.id,
+                              request.search_text, request.options));
+}
+
+void FindRequestManager::SendStopFindingIPC(StopFindAction action,
+                                            RenderFrameHost* rfh) const {
+  rfh->Send(new FrameMsg_StopFinding(rfh->GetRoutingID(), action));
+}
+
+void FindRequestManager::NotifyFindReply(int request_id,
+                                         bool final_update) const {
+  if (request_id == kInvalidId) {
+    NOTREACHED();
+    return;
+  }
+
+  contents_->NotifyFindReply(request_id, number_of_matches_, selection_rect_,
+                             active_match_ordinal_, final_update);
+}
+
+#if defined(OS_ANDROID)
+void FindRequestManager::SendFindMatchRectsIPC(RenderFrameHost* rfh) {
+  rfh->Send(new FrameMsg_FindMatchRects(rfh->GetRoutingID(),
+                                        match_rects_.request_version));
+}
+#endif
+
+}  // namespace content