Move some accessibility methods, enums and interfaces into the content/public API.

content/browser/accessibility/dump_accessibility_tree_helper.cc

Index: content/browser/accessibility/dump_accessibility_tree_helper.cc
diff --git a/content/browser/accessibility/dump_accessibility_tree_helper.cc b/content/browser/accessibility/dump_accessibility_tree_helper.cc
index 99efca21b3209a2a2b3c40fd44d04799ecb465cb..8d6b31cda3a4cb9521fe5fc514f56ef288bd2f5c 100644
--- a/content/browser/accessibility/dump_accessibility_tree_helper.cc
+++ b/content/browser/accessibility/dump_accessibility_tree_helper.cc
@@ -8,6 +8,10 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
+#include "content/browser/accessibility/browser_accessibility_manager.h"
+#include "content/port/browser/render_widget_host_view_port.h"
+#include "content/public/browser/render_view_host.h"
+#include "content/public/browser/web_contents.h"
 
 namespace content {
 namespace {
@@ -15,16 +19,33 @@ const int kIndentSpaces = 4;
 const char* kSkipString = "@NO_DUMP";
 }
 
-DumpAccessibilityTreeHelper::DumpAccessibilityTreeHelper() {
+DumpAccessibilityTreeHelper::DumpAccessibilityTreeHelper(
+    BrowserAccessibility* node)
+    : node_(node) {
   Initialize();
 }
 
+// static
+AccessibilityTreeFormatter* AccessibilityTreeFormatter::From(
+    RenderViewHost* rvh) {
+  RenderWidgetHostViewPort* host_view = static_cast<RenderWidgetHostViewPort*>(
+      WebContents::FromRenderViewHost(rvh)->GetRenderWidgetHostView());
+
+  content::BrowserAccessibilityManager* manager =
+      host_view->GetBrowserAccessibilityManager();
+  if (!manager)
+    return NULL;
+
+  content::BrowserAccessibility* root = manager->GetRoot();
+  return new DumpAccessibilityTreeHelper(root);
+}
+
+
 DumpAccessibilityTreeHelper::~DumpAccessibilityTreeHelper() {
 }
 
-void DumpAccessibilityTreeHelper::DumpAccessibilityTree(
-    BrowserAccessibility* node, string16* contents) {
-  RecursiveDumpAccessibilityTree(node, contents, 0);
+void DumpAccessibilityTreeHelper::FormatAccessibilityTree(string16* contents) {
+  RecursiveDumpAccessibilityTree(node_, contents, 0);
 }
 
 void DumpAccessibilityTreeHelper::RecursiveDumpAccessibilityTree(
@@ -51,7 +72,7 @@ void DumpAccessibilityTreeHelper::SetFilters(
 }
 
 bool DumpAccessibilityTreeHelper::MatchesFilters(
-    const string16& text, bool default_result) {
+    const string16& text, bool default_result) const {
   std::vector<Filter>::const_iterator iter = filters_.begin();
   bool allow = default_result;
   for (iter = filters_.begin(); iter != filters_.end(); ++iter) {