Revert of Introduce TextFinder class.

Source/web/WebFrameImpl.h

Index: Source/web/WebFrameImpl.h
diff --git a/Source/web/WebFrameImpl.h b/Source/web/WebFrameImpl.h
index 5d00126bf014623e2b0c4a55c5d48571f12ccce3..ab2fb86e9b76c36ce8705175efaa3ea20260c38b 100644
--- a/Source/web/WebFrameImpl.h
+++ b/Source/web/WebFrameImpl.h
@@ -58,7 +58,6 @@
 namespace blink {
 class ChromePrintContext;
 class SharedWorkerRepositoryClientImpl;
-class TextFinder;
 class WebDataSourceImpl;
 class WebInputElement;
 class WebFrameClient;
@@ -278,11 +277,11 @@
     // Returns which frame has an active match. This function should only be
     // called on the main frame, as it is the only frame keeping track. Returned
     // value can be 0 if no frame has an active match.
-    WebFrameImpl* activeMatchFrame() const;
+    WebFrameImpl* activeMatchFrame() const { return m_currentActiveMatchFrame; }
 
     // Returns the active match in the current frame. Could be a null range if
     // the local frame has no active match.
-    WebCore::Range* activeMatch() const;
+    WebCore::Range* activeMatch() const { return m_activeMatch.get(); }
 
     // When a Find operation ends, we want to set the selection to what was active
     // and set focus to the first focusable node we find (starting with the first
@@ -310,17 +309,108 @@
 
     static void selectWordAroundPosition(WebCore::Frame*, WebCore::VisiblePosition);
 
-    // Returns the text finder object if it already exists.
-    // Otherwise creates it and then returns.
-    TextFinder& getOrCreateTextFinder();
-
 private:
+    class DeferredScopeStringMatches;
+    friend class DeferredScopeStringMatches;
     friend class FrameLoaderClientImpl;
+
+    struct FindMatch {
+        RefPtr<WebCore::Range> m_range;
+
+        // 1-based index within this frame.
+        int m_ordinal;
+
+        // In find-in-page coordinates.
+        // Lazily calculated by updateFindMatchRects.
+        WebCore::FloatRect m_rect;
+
+        FindMatch(PassRefPtr<WebCore::Range>, int ordinal);
+    };
+
+    // A bit mask specifying area of the frame to invalidate.
+    enum AreaToInvalidate {
+      InvalidateNothing,
+      InvalidateContentArea,
+      InvalidateScrollbar,   // Vertical scrollbar only.
+      InvalidateAll          // Both content area and the scrollbar.
+    };
 
     WebFrameImpl(WebFrameClient*, long long frame_identifier);
 
     // Sets the local WebCore frame and registers destruction observers.
     void setWebCoreFrame(PassRefPtr<WebCore::Frame>);
+
+    // Notifies the delegate about a new selection rect.
+    void reportFindInPageSelection(
+        const WebRect& selectionRect, int activeMatchOrdinal, int identifier);
+
+    // Clear the find-in-page matches cache forcing rects to be fully
+    // calculated again next time updateFindMatchRects is called.
+    void clearFindMatchesCache();
+
+    // Check if the activeMatchFrame still exists in the frame tree.
+    bool isActiveMatchFrameValid() const;
+
+    // Return the index in the find-in-page cache of the match closest to the
+    // provided point in find-in-page coordinates, or -1 in case of error.
+    // The squared distance to the closest match is returned in the distanceSquared parameter.
+    int nearestFindMatch(const WebCore::FloatPoint&, float& distanceSquared);
+
+    // Select a find-in-page match marker in the current frame using a cache
+    // match index returned by nearestFindMatch. Returns the ordinal of the new
+    // selected match or -1 in case of error. Also provides the bounding box of
+    // the marker in window coordinates if selectionRect is not null.
+    int selectFindMatch(unsigned index, WebRect* selectionRect);
+
+    // Compute and cache the rects for FindMatches if required.
+    // Rects are automatically invalidated in case of content size changes,
+    // propagating the invalidation to child frames.
+    void updateFindMatchRects();
+
+    // Append the find-in-page match rects of the current frame to the provided vector.
+    void appendFindMatchRects(Vector<WebFloatRect>& frameRects);
+
+    // Invalidates a certain area within the frame.
+    void invalidateArea(AreaToInvalidate);
+
+    // Add a WebKit TextMatch-highlight marker to nodes in a range.
+    void addMarker(WebCore::Range*, bool activeMatch);
+
+    // Sets the markers within a range as active or inactive.
+    void setMarkerActive(WebCore::Range*, bool active);
+
+    // Returns the ordinal of the first match in the frame specified. This
+    // function enumerates the frames, starting with the main frame and up to (but
+    // not including) the frame passed in as a parameter and counts how many
+    // matches have been found.
+    int ordinalOfFirstMatchForFrame(WebFrameImpl*) const;
+
+    // Determines whether the scoping effort is required for a particular frame.
+    // It is not necessary if the frame is invisible, for example, or if this
+    // is a repeat search that already returned nothing last time the same prefix
+    // was searched.
+    bool shouldScopeMatches(const WTF::String& searchText);
+
+    // Removes the current frame from the global scoping effort and triggers any
+    // updates if appropriate. This method does not mark the scoping operation
+    // as finished.
+    void flushCurrentScopingEffort(int identifier);
+
+    // Finishes the current scoping effort and triggers any updates if appropriate.
+    void finishCurrentScopingEffort(int identifier);
+
+    // Queue up a deferred call to scopeStringMatches.
+    void scopeStringMatchesSoon(
+        int identifier, const WebString& searchText, const WebFindOptions&,
+        bool reset);
+
+    // Called by a DeferredScopeStringMatches instance.
+    void callScopeStringMatches(
+        DeferredScopeStringMatches*, int identifier, const WebString& searchText,
+        const WebFindOptions&, bool reset);
+
+    // Determines whether to invalidate the content area and scrollbar.
+    void invalidateIfNecessary();
 
     void loadJavaScriptURL(const WebCore::KURL&);
 
@@ -354,8 +444,78 @@
     WebPermissionClient* m_permissionClient;
     OwnPtr<SharedWorkerRepositoryClientImpl> m_sharedWorkerRepositoryClient;
 
-    // Will be initialized after first call to find() or scopeStringMatches().
-    OwnPtr<TextFinder> m_textFinder;
+    // A way for the main frame to keep track of which frame has an active
+    // match. Should be 0 for all other frames.
+    WebFrameImpl* m_currentActiveMatchFrame;
+
+    // The range of the active match for the current frame.
+    RefPtr<WebCore::Range> m_activeMatch;
+
+    // The index of the active match for the current frame.
+    int m_activeMatchIndexInCurrentFrame;
+
+    // This flag is used by the scoping effort to determine if we need to figure
+    // out which rectangle is the active match. Once we find the active
+    // rectangle we clear this flag.
+    bool m_locatingActiveRect;
+
+    // The scoping effort can time out and we need to keep track of where we
+    // ended our last search so we can continue from where we left of.
+    RefPtr<WebCore::Range> m_resumeScopingFromRange;
+
+    // Keeps track of the last string this frame searched for. This is used for
+    // short-circuiting searches in the following scenarios: When a frame has
+    // been searched and returned 0 results, we don't need to search that frame
+    // again if the user is just adding to the search (making it more specific).
+    WTF::String m_lastSearchString;
+
+    // Keeps track of how many matches this frame has found so far, so that we
+    // don't loose count between scoping efforts, and is also used (in conjunction
+    // with m_lastSearchString) to figure out if we need to search the frame again.
+    int m_lastMatchCount;
+
+    // This variable keeps a cumulative total of matches found so far for ALL the
+    // frames on the page, and is only incremented by calling IncreaseMatchCount
+    // (on the main frame only). It should be -1 for all other frames.
+    int m_totalMatchCount;
+
+    // This variable keeps a cumulative total of how many frames are currently
+    // scoping, and is incremented/decremented on the main frame only.
+    // It should be -1 for all other frames.
+    int m_framesScopingCount;
+
+    // Identifier of the latest find-in-page request. Required to be stored in
+    // the frame in order to reply if required in case the frame is detached.
+    int m_findRequestIdentifier;
+
+    // Keeps track of whether there is an scoping effort ongoing in the frame.
+    bool m_scopingInProgress;
+
+    // Keeps track of whether the last find request completed its scoping effort
+    // without finding any matches in this frame.
+    bool m_lastFindRequestCompletedWithNoMatches;
+
+    // Keeps track of when the scoping effort should next invalidate the scrollbar
+    // and the frame area.
+    int m_nextInvalidateAfter;
+
+    // A list of all of the pending calls to scopeStringMatches.
+    Vector<DeferredScopeStringMatches*> m_deferredScopingWork;
+
+    // Version number incremented on the main frame only whenever the document
+    // find-in-page match markers change. It should be 0 for all other frames.
+    int m_findMatchMarkersVersion;
+
+    // Local cache of the find match markers currently displayed for this frame.
+    Vector<FindMatch> m_findMatchesCache;
+
+    // Determines if the rects in the find-in-page matches cache of this frame
+    // are invalid and should be recomputed.
+    bool m_findMatchRectsAreValid;
+
+    // Contents size when find-in-page match rects were last computed for this
+    // frame's cache.
+    WebCore::IntSize m_contentsSizeForCurrentFindMatchRects;
 
     // Valid between calls to BeginPrint() and EndPrint(). Containts the print
     // information. Is used by PrintPage().