Use a placeholder instead of the default plugin for missing plug-ins on Mac and Linux.

chrome/common/render_messages.h

 // Copyright (c) 2011 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.
 
 // Multiply-included file, no traditional include guard.
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 13 matching lines @@
 #include "chrome/common/search_provider.h"
 #include "chrome/common/thumbnail_score.h"
 #include "chrome/common/translate_errors.h"
 #include "content/common/common_param_traits.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/ipc_platform_file.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebCache.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebConsoleMessage.h"
 #include "ui/gfx/rect.h"
+#include "webkit/plugins/webplugininfo.h"
 
 // Singly-included section for enums and custom IPC traits.
 #ifndef CHROME_COMMON_RENDER_MESSAGES_H_
 #define CHROME_COMMON_RENDER_MESSAGES_H_
 
 class SkBitmap;
 
 // Command values for the cmd parameter of the
 // ViewHost_JavaScriptStressTestControl message. For each command the parameter
 // passed has a different meaning:
 // For the command kJavaScriptStressTestSetStressRunType the parameter it the
 // type taken from the enumeration v8::Testing::StressType.
 // For the command kJavaScriptStressTestPrepareStressRun the parameter it the
 // number of the stress run about to take place.
 enum ViewHostMsg_JavaScriptStressTestControl_Commands {
   kJavaScriptStressTestSetStressRunType = 0,
   kJavaScriptStressTestPrepareStressRun = 1,
 };
 
+struct ChromeViewHostMsg_GetPluginInfo_Status {
+  // TODO(bauerb): Add more status values (blocked, click-to-play, out of date,
+  // requires authorization).
+  enum Value {
+    kAllowed,
+    kDisabled,
+    kNotFound,
+  };
+};
+
 namespace IPC {
 
 #if defined(OS_POSIX) && !defined(USE_AURA)
 
 // TODO(port): this shouldn't exist. However, the plugin stuff is really using
 // HWNDS (NativeView), and making Windows calls based on them. I've not figured
 // out the deal with plugins yet.
 template <>
 struct ParamTraits<gfx::NativeView> {
   typedef gfx::NativeView param_type;
@@ skipping 21 matching lines @@
   static bool Read(const Message* m, void** iter, param_type* r);
   static void Log(const param_type& p, std::string* l);
 };
 
 }  // namespace IPC
 
 #endif  // CHROME_COMMON_RENDER_MESSAGES_H_
 
 #define IPC_MESSAGE_START ChromeMsgStart
 
+IPC_ENUM_TRAITS(ChromeViewHostMsg_GetPluginInfo_Status::Value)
 IPC_ENUM_TRAITS(InstantCompleteBehavior)
 IPC_ENUM_TRAITS(search_provider::OSDDType)
 IPC_ENUM_TRAITS(search_provider::InstallState)
 IPC_ENUM_TRAITS(TranslateErrors::Type)
 IPC_ENUM_TRAITS(WebKit::WebConsoleMessage::Level)
 
 IPC_STRUCT_TRAITS_BEGIN(ThumbnailScore)
   IPC_STRUCT_TRAITS_MEMBER(boring_score)
   IPC_STRUCT_TRAITS_MEMBER(good_clipping)
   IPC_STRUCT_TRAITS_MEMBER(at_top)
@@ skipping 16 matching lines @@
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(WebKit::WebCache::UsageStats)
   IPC_STRUCT_TRAITS_MEMBER(minDeadCapacity)
   IPC_STRUCT_TRAITS_MEMBER(maxDeadCapacity)
   IPC_STRUCT_TRAITS_MEMBER(capacity)
   IPC_STRUCT_TRAITS_MEMBER(liveSize)
   IPC_STRUCT_TRAITS_MEMBER(deadSize)
 IPC_STRUCT_TRAITS_END()
 
+IPC_STRUCT_BEGIN(ChromeViewHostMsg_GetPluginInfo_Params)

[jam, 2011/09/30 17:01:21]

nit: we normally don't create structs unless we need > 4 parameters which is
what our IPC macros support. if you're just sending 3 out parameters, use
IPC_SYNC_MESSAGE_CONTROL4_3

[Bernhard Bauer, 2011/09/30 17:22:21]

I need to forward-declare the struct, and I can't do that for an enum. It looks
to me like including one of these _messages.h files in another *header* doesn't
work (because the missing include guards screw things up), so if I want to refer
to the message parameters in a header file, I have to forward-declare them :-/

[jam, 2011/09/30 17:40:19]

that's by design, since there's a lot of unnecessary template expansion when
they're included in headers
if you make ChromeRenderMessageFilter::PluginsLoaded() do all the work (and not
have GetPluginInfo()), then you don't need to forward declare this enum in a
header. the function except for the last two lines would only be indented once
more.

[Bernhard Bauer, 2011/10/05 13:34:33]

I split up ChromeViewHostMsg_GetPluginInfo_Params into its components. I kept
ChromeViewHostMsg_GetPluginInfo_Status for the forward-declaration (having a
nice signature for CRMF::GetPluginInfo makes it easier to unit-test it, for
example, and there are other instances of wrapping an enum in a struct, like
ViewMsg_StopFinding_Params).

+  IPC_STRUCT_MEMBER(ChromeViewHostMsg_GetPluginInfo_Status::Value, status)
+  IPC_STRUCT_MEMBER(webkit::WebPluginInfo, plugin)
+  IPC_STRUCT_MEMBER(std::string, actual_mime_type)
+IPC_STRUCT_END()
+
+
 //-----------------------------------------------------------------------------
 // RenderView messages
 // These are messages sent from the browser to the renderer process.
 
 // Tells the renderer to set its maximum cache size to the supplied value.
 IPC_MESSAGE_CONTROL3(ChromeViewMsg_SetCacheCapacities,
                      size_t /* min_dead_capacity */,
                      size_t /* max_dead_capacity */,
                      size_t /* capacity */)
 
@@ skipping 237 matching lines @@
 //
 // If |setting| is set to CONTENT_SETTING_DEFAULT, the plug-in is
 // neither blocked nor white-listed, which means that it's allowed
 // by default and can still be blocked if it's non-sandboxed.
 //
 IPC_SYNC_MESSAGE_CONTROL2_1(ChromeViewHostMsg_GetPluginContentSetting,
                             GURL /* policy_url */,
                             std::string  /* resource */,
                             ContentSetting /* setting */)
 
+// Return information about a plugin for the given URL and MIME type.
+// In contrast to ViewHostMsg_GetPluginInfo in content/, this IPC call knows
+// about specific reasons why a plug-in can't be used, for example because it's
+// disabled.
+IPC_SYNC_MESSAGE_CONTROL4_1(ChromeViewHostMsg_GetPluginInfo,
+                            int /* render_view_id */,
+                            GURL /* url */,
+                            GURL /* top origin url */,
+                            std::string /* mime_type */,
+                            ChromeViewHostMsg_GetPluginInfo_Params /* params */)
+
 // Specifies the URL as the first parameter (a wstring) and thumbnail as
 // binary data as the second parameter.
 IPC_MESSAGE_ROUTED3(ChromeViewHostMsg_Thumbnail,
                     GURL /* url */,
                     ThumbnailScore /* score */,
                     SkBitmap /* bitmap */)
 
 // Send a snapshot of the tab contents to the render host.
 IPC_MESSAGE_ROUTED1(ChromeViewHostMsg_Snapshot,
                     SkBitmap /* bitmap */)
@@ skipping 160 matching lines @@
 // previous SetCookie message to be processed.
 IPC_SYNC_MESSAGE_ROUTED2_1(ChromeViewHostMsg_GetCookies,
                            GURL /* url */,
                            GURL /* first_party_for_cookies */,
                            std::string /* cookies */)
 
 // Provide the browser process with current renderer framerate.
 IPC_MESSAGE_CONTROL2(ChromeViewHostMsg_FPS,
                      int /* routing id */,
                      float /* frames per second */)