Expose attributes max, min, value for meter html tag

content/renderer/accessibility/blink_ax_tree_source.cc

 // 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.
 
 #include "content/renderer/accessibility/blink_ax_tree_source.h"
 
 #include <set>
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
@@ skipping 389 matching lines @@
                           src.containerLiveRegionAtomic());
     dst->AddBoolAttribute(ui::AX_ATTR_CONTAINER_LIVE_BUSY,
                           src.containerLiveRegionBusy());
     dst->AddStringAttribute(ui::AX_ATTR_CONTAINER_LIVE_STATUS,
                             UTF16ToUTF8(src.containerLiveRegionStatus()));
     dst->AddStringAttribute(ui::AX_ATTR_CONTAINER_LIVE_RELEVANT,
                             UTF16ToUTF8(src.containerLiveRegionRelevant()));
   }
 
   if (dst->role == ui::AX_ROLE_PROGRESS_INDICATOR ||
+      dst->role == ui::AX_ROLE_METER ||
       dst->role == ui::AX_ROLE_SCROLL_BAR ||
       dst->role == ui::AX_ROLE_SLIDER ||
       dst->role == ui::AX_ROLE_SPIN_BUTTON) {
     dst->AddFloatAttribute(ui::AX_ATTR_VALUE_FOR_RANGE, src.valueForRange());
     dst->AddFloatAttribute(ui::AX_ATTR_MAX_VALUE_FOR_RANGE,
                            src.maxValueForRange());
     dst->AddFloatAttribute(ui::AX_ATTR_MIN_VALUE_FOR_RANGE,
                            src.minValueForRange());
   }
 
@@ skipping 149 matching lines @@
     AddIntListAttributeFromWebObjects(ui::AX_ATTR_OWNS_IDS, owns, dst);
 }
 
 blink::WebDocument BlinkAXTreeSource::GetMainDocument() const {
   if (render_frame_ && render_frame_->GetWebFrame())
     return render_frame_->GetWebFrame()->document();
   return WebDocument();
 }
 
 }  // namespace content