Manky attempt with TextInputClient

ui/accessibility/platform/ax_platform_node_mac.mm

 // 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.
 
 #import "ui/accessibility/platform/ax_platform_node_mac.h"
 
 #import <Cocoa/Cocoa.h>
 #include <stddef.h>
 
 #include "base/macros.h"
 #include "base/strings/sys_string_conversions.h"
 #include "ui/accessibility/ax_action_data.h"
 #include "ui/accessibility/ax_node_data.h"
 #include "ui/accessibility/ax_role_properties.h"
 #include "ui/accessibility/platform/ax_platform_node.h"
 #include "ui/accessibility/platform/ax_platform_node_delegate.h"
 #include "ui/base/l10n/l10n_util.h"
+#include "ui/base/text/text_properties.h"
+#include "ui/gfx/geometry/rect.h"
 #import "ui/gfx/mac/coordinate_conversion.h"
+#include "ui/gfx/range/range.h"
 #include "ui/strings/grit/ui_strings.h"
 
 namespace {
 
 struct RoleMapEntry {
   ui::AXRole value;
   NSString* nativeValue;
 };
 
 struct EventMapEntry {
@@ skipping 665 matching lines @@
 }
 
 - (id)AXRangeForIndex:(id)parameter {
   DCHECK([parameter isKindOfClass:[NSNumber class]]);
   NOTIMPLEMENTED();
   return nil;
 }
 
 - (id)AXBoundsForRange:(id)parameter {
   DCHECK([parameter isKindOfClass:[NSValue class]]);
-  // TODO(tapted): Provide an accessor on AXPlatformNodeDelegate to obtain this
-  // from ui::TextInputClient::GetCompositionCharacterBounds().
-  NOTIMPLEMENTED();
+  if (ui::TextInputClient* text = node_->GetDelegate()->GetTextInputClient()) {
+    gfx::Range actualRange;
+    gfx::Rect rect = ui::GetFirstRectForTextInputRange(
+        text, gfx::Range([parameter rangeValue]), &actualRange);
+    // GetFirstRectForTextInputRange() can "fail", in which case it returns
+    // the caret bounds. That might be weird.
+    rect.set_width(30);
+    DLOG(INFO) << text << " -> " << actualRange.ToString() << " -> "
+               << rect.ToString();
+    return [NSValue valueWithRect:gfx::ScreenRectToNSRect(rect)];
+  } else {
+    DLOG(INFO) << "it null";
+  }
   return nil;
 }
 
 - (id)AXRTFForRange:(id)parameter {
   DCHECK([parameter isKindOfClass:[NSValue class]]);
   NOTIMPLEMENTED();
   return nil;
 }
 
 - (id)AXStyleRangeForIndex:(id)parameter {
@@ skipping 67 matching lines @@
   }
   NotifyMacEvent(native_node_, event_type);
 }
 
 int AXPlatformNodeMac::GetIndexInParent() {
   // TODO(dmazzoni): implement this.  http://crbug.com/396137
   return -1;
 }
 
 }  // namespace ui