Implemented the reporting of text style and language information on Windows.

content/browser/accessibility/browser_accessibility_win.h

Index: content/browser/accessibility/browser_accessibility_win.h
diff --git a/content/browser/accessibility/browser_accessibility_win.h b/content/browser/accessibility/browser_accessibility_win.h
index adeb16b494be11ddfd180512c68892ed64cb7def..9dda167a59124477ce6b11f53100d6b1ec796cf0 100644
--- a/content/browser/accessibility/browser_accessibility_win.h
+++ b/content/browser/accessibility/browser_accessibility_win.h
@@ -15,6 +15,7 @@
 #include <vector>
 
 #include "base/compiler_specific.h"
+#include "base/containers/hash_tables.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "content/browser/accessibility/browser_accessibility.h"
@@ -727,6 +728,10 @@ BrowserAccessibilityWin
   base::string16 name() const { return win_attributes_->name; }
   base::string16 description() const { return win_attributes_->description; }
   base::string16 value() const { return win_attributes_->value; }
+  base::hash_map<int, std::vector<base::string16>>& offset_to_text_attributes()
+      const {
+    return win_attributes_->offset_to_text_attributes;
+  }
   std::map<int32_t, int32_t>& hyperlink_offset_to_index() const {
     return win_attributes_->hyperlink_offset_to_index;
   }
@@ -790,6 +795,9 @@ BrowserAccessibilityWin
 
   // Returns true if the current object is an IA2 hyperlink.
   bool IsHyperlink() const;
+  // Returns the hyperlink at the given text position, or nullptr if no
+  // hyperlink can be found.
+  BrowserAccessibilityWin* GetHyperlinkFromHypertextOffset(int offset) const;
 
   // Functions for retrieving offsets for hyperlinks and hypertext.
   // Return -1 in case of failure.
@@ -836,6 +844,9 @@ BrowserAccessibilityWin
   void ComputeHypertextRemovedAndInserted(
       int* start, int* old_len, int* new_len);
 
+  // Computes the IA2 text style attributes upon being requested.
+  void ComputeTextAttributes();
+
   // If offset is a member of IA2TextSpecialOffsets this function updates the
   // value of offset and returns, otherwise offset remains unchanged.
   void HandleSpecialTextOffset(const base::string16& text, LONG* offset);
@@ -851,22 +862,28 @@ BrowserAccessibilityWin
                     LONG start_offset,
                     ui::TextBoundaryDirection direction);
 
+  // Searches forward from the given offset until the start of the next style
+  // is found, or searches backward from the given offset until the start of the
+  // current style is found.
+  LONG FindStartOfStyle(LONG start_offset,
+                        ui::TextBoundaryDirection direction) const;
+
   // Return a pointer to the object corresponding to the given id,
   // does not make a new reference.
-  BrowserAccessibilityWin* GetFromID(int32_t id);
+  BrowserAccessibilityWin* GetFromID(int32_t id) const;
 
   // Returns true if this is a list box option with a parent of type list box,
   // or a menu list option with a parent of type menu list popup.
   bool IsListBoxOptionOrMenuListOption();
 
-  // Updates object attributes of IA2 with html attributes.
-  void UpdateRequiredAttributes();
-
   // Given an int list attribute containing the ids of related elements,
   // add a new IAccessibleRelation for this object with the given type name.
   void AddRelations(ui::AXIntListAttribute src_attr,
                     const base::string16& iaccessiblerelation_type);
 
+  // Updates object attributes of IA2 with html attributes.
+  void UpdateRequiredAttributes();
+
   // Windows-specific unique ID (unique within the browser process),
   // used for get_accChild, NotifyWinEvent, and as the unique ID for
   // IAccessible2 and ISimpleDOM.
@@ -896,6 +913,9 @@ BrowserAccessibilityWin
     // Hypertext.
     base::string16 hypertext;
 
+    // Maps each style span to its start offset in hypertext.
+    base::hash_map<int, std::vector<base::string16>> offset_to_text_attributes;
+
     // Maps the |hypertext_| embedded character offset to an index in
     // |hyperlinks_|.
     std::map<int32_t, int32_t> hyperlink_offset_to_index;