Convert the async device ID getter to a chrome resource host

content/public/browser/browser_ppapi_host.h

Index: content/public/browser/browser_ppapi_host.h
diff --git a/content/public/browser/browser_ppapi_host.h b/content/public/browser/browser_ppapi_host.h
index aa9799071cd2460ab1fc02226121d90321348fe8..7dda6ff0b3717b0dadce9815d5238b302fd3e03f 100644
--- a/content/public/browser/browser_ppapi_host.h
+++ b/content/public/browser/browser_ppapi_host.h
@@ -5,8 +5,12 @@
 #ifndef CONTENT_PUBLIC_BROWSER_BROWSER_PPAPI_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_BROWSER_PPAPI_HOST_H_
 
+#include "base/callback_forward.h"
 #include "base/process.h"
 #include "content/common/content_export.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/render_view_host.h"
+#include "ppapi/c/pp_instance.h"
 
 namespace ppapi {
 namespace host {
@@ -23,12 +27,31 @@ namespace content {
 // lives entirely on the I/O thread.
 class CONTENT_EXPORT BrowserPpapiHost {
  public:
+  struct RenderViewIDs {
+    int process_id;
+    int view_id;
+  };
+
   // Returns the PpapiHost object.
   virtual ppapi::host::PpapiHost* GetPpapiHost() = 0;
 
   // Returns the handle to the plugin process.
   virtual base::ProcessHandle GetPluginProcessHandle() const = 0;
 
+  // Returns true if the given PP_Instance is valid.
+  virtual bool IsValidInstance(PP_Instance instance) const = 0;
+
+  // Returns the process/view Ids associated with the RenderView containing the
+  // given instance. If the instance is invalid, the ids will be 0.
+  //
+  // When a resource is created, the PP_Instance should already have been
+  // validated, and the resource hosts will be deleted when the resource is
+  // destroyed. So it should not generally be necessary to check for errors
+  // from this function except as a last-minute sanity check if you conver the

[yzshen1, 2012/09/11 20:43:22]

conver->convert

+  // IDs to a RenderView/ProcessHost on the UI thread.
+  virtual RenderViewIDs GetRenderViewIDsForInstance(
+      PP_Instance instance) const = 0;
+
  protected:
   virtual ~BrowserPpapiHost() {}
 };