Adds color, font size, text direction and text styles to the accessibility tree.

ui/accessibility/ax_enums.idl

Index: ui/accessibility/ax_enums.idl
diff --git a/ui/accessibility/ax_enums.idl b/ui/accessibility/ax_enums.idl
index 43c9e4b15cdab928817dc4d01bbbfd364788af2d..b17f2c840afdb927b0b57633643b05cfa56ad5b4 100644
--- a/ui/accessibility/ax_enums.idl
+++ b/ui/accessibility/ax_enums.idl
@@ -299,14 +299,6 @@
     title_ui_element,
     activedescendant_id,
 
-    // Color value for AX_ROLE_COLOR_WELL, each component is 0..255
-    color_value_red,
-    color_value_green,
-    color_value_blue,
-
-    // Inline text attributes.
-    text_direction,
-
     // Uniquely identifies an AXTree.
     tree_id,
 
@@ -317,9 +309,25 @@
     set_size,
     pos_in_set,
 
+    // In the case of AX_ROLE_COLOR_WELL, specifies the selected color.
+    color_value,
+
+
+    // Text attributes.
+
+    // Foreground and background color in RGBA.
+    background_color,
+    color,
+
     // Indicates if a form control has invalid input or
     // if an element has an aria-invalid attribute.
-    invalid_state
+    invalid_state,
+
+    // Specifies the direction of the text, e.g., right-to-left.
+    text_direction,
+
+    // Bold, italic, underline, etc.
+    text_style
   };
 
   [cpp_enum_prefix_override="ax_attr"] enum AXFloatAttribute {
@@ -329,7 +337,10 @@
     // Range attributes.
     value_for_range,
     min_value_for_range,
-    max_value_for_range
+    max_value_for_range,
+
+    // Text attributes.
+    font_size // In pixels.
   };
 
   [cpp_enum_prefix_override="ax_attr"] enum AXBoolAttribute {
@@ -409,10 +420,17 @@
   };
 
   [cpp_enum_prefix_override="ax"] enum AXTextDirection {
-    text_direction_lr,
-    text_direction_rl,
-    text_direction_tb,
-    text_direction_bt
+    text_direction_ltr,
+    text_direction_rtl,
+    text_direction_ttb,
+    text_direction_btt
+  };
+
+  [cpp_enum_prefix_override="ax"] enum AXTextStyle {
+    text_style_bold,
+    text_style_italic,
+    text_style_underline,
+    text_style_line_through
   };
 
   [cpp_enum_prefix_override="ax"] enum AXInvalidState {