Hook up the PPB_Flash_Print interface to new host system.

chrome/renderer/pepper/pepper_flash_renderer_message_filter.h

Index: chrome/renderer/pepper/pepper_flash_renderer_message_filter.h
diff --git a/chrome/renderer/pepper/pepper_flash_renderer_message_filter.h b/chrome/renderer/pepper/pepper_flash_renderer_message_filter.h
new file mode 100644
index 0000000000000000000000000000000000000000..09f7b84efe57abaea3d6a1d1097fd3d1c64a1575
--- /dev/null
+++ b/chrome/renderer/pepper/pepper_flash_renderer_message_filter.h
@@ -0,0 +1,37 @@
+// Copyright (c) 2012 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.
+
+#ifndef CHROME_RENDERER_PEPPER_PEPPER_FLASH_RENDERER_MESSAGE_FILTER_H_
+#define CHROME_RENDERER_PEPPER_PEPPER_FLASH_RENDERER_MESSAGE_FILTER_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "ppapi/c/pp_instance.h"
+#include "ppapi/host/instance_message_filter.h"
+
+namespace chrome {
+
+// Implements the backend for Flash-specific messages from a plugin process.
+class PepperFlashRendererMessageFilter
+    : public ppapi::host::InstanceMessageFilter {
+ public:
+  // This class is designed to be heap-allocated. It will attach itself to the
+  // given host and delete itself when the host is destroyed.
+  explicit PepperFlashRendererMessageFilter(ppapi::host::PpapiHost* host);

[dmichael (off chromium), 2012/07/25 16:57:27]

optional: It seems like this is following the same pattern as
RenderViewObservers, but the pattern might be clearer (and impossible to get
wrong) if you made the constructor private and had a static Create function that
only heap allocates the object (and maybe doesn't even return a pointer). The
"new Blah(renderview)" stuff threw me for a loop at first.

+  virtual ~PepperFlashRendererMessageFilter();
+
+  // InstanceMessageFilter:
+  virtual void PpapiHostDestroyed(ppapi::host::PpapiHost* host) OVERRIDE;
+  virtual bool OnInstanceMessageReceived(const IPC::Message& msg) OVERRIDE;
+
+ private:
+  // Message handlers.
+  void OnHostMsgInvokePrinting(PP_Instance instance);
+
+  DISALLOW_COPY_AND_ASSIGN(PepperFlashRendererMessageFilter);
+};
+
+}  // namespace chrome
+
+#endif  // CHROME_RENDERER_PEPPER_PEPPER_FLASH_RENDERER_MESSAGE_FILTER_H_