Pepper: Clean up ProgressEvent logic.

This simplifies NexeLoadManager, which is getting pretty big. This also removes
an unused field from ProgressEvent, and adds a convenience function for posting
a task to dispatch a progress event from the main thread, which is often
necessary to ensure that progress events are posted to the DOM after other
state changes.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=269362

R=dmichael@chromium.org

Review URL: https://codereview.chromium.org/270453004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269784 0039d316-1c4b-4281-b951-d872f2087c98

6 files changed, 178 insertions, 181 deletions

diff --git a/components/nacl.gyp b/components/nacl.gyp
index 8596924..a7b2538 100644
--- a/components/nacl.gyp
+++ b/components/nacl.gyp
@@ -167,6 +167,8 @@
             'nacl/renderer/pnacl_translation_resource_host.h',
             'nacl/renderer/ppb_nacl_private_impl.cc',
             'nacl/renderer/ppb_nacl_private_impl.h',
+            'nacl/renderer/progress_event.cc',
+            'nacl/renderer/progress_event.h',
             'nacl/renderer/sandbox_arch.cc',
             'nacl/renderer/sandbox_arch.h',
             'nacl/renderer/trusted_plugin_channel.cc',
diff --git a/components/nacl/renderer/nexe_load_manager.cc b/components/nacl/renderer/nexe_load_manager.cc
index 94b56b5..658f0cf 100644
--- a/components/nacl/renderer/nexe_load_manager.cc
+++ b/components/nacl/renderer/nexe_load_manager.cc
@@ -14,6 +14,7 @@
 #include "components/nacl/renderer/histogram.h"
 #include "components/nacl/renderer/manifest_service_channel.h"
 #include "components/nacl/renderer/pnacl_translation_resource_host.h"
+#include "components/nacl/renderer/progress_event.h"
 #include "components/nacl/renderer/sandbox_arch.h"
 #include "components/nacl/renderer/trusted_plugin_channel.h"
 #include "content/public/common/content_client.h"
@@ -33,10 +34,8 @@
 #include "ppapi/shared_impl/var.h"
 #include "ppapi/shared_impl/var_tracker.h"
 #include "ppapi/thunk/enter.h"
-#include "third_party/WebKit/public/web/WebDOMResourceProgressEvent.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebElement.h"
-#include "third_party/WebKit/public/web/WebLocalFrame.h"
 #include "third_party/WebKit/public/web/WebPluginContainer.h"
 #include "third_party/WebKit/public/web/WebView.h"
 #include "v8/include/v8.h"
@@ -60,27 +59,6 @@ const char* const kDevAttribute = "@dev";
 const char* const kNaClMIMEType = "application/x-nacl";
 const char* const kPNaClMIMEType = "application/x-pnacl";
 
-blink::WebString EventTypeToString(PP_NaClEventType event_type) {
-  switch (event_type) {
-    case PP_NACL_EVENT_LOADSTART:
-      return blink::WebString::fromUTF8("loadstart");
-    case PP_NACL_EVENT_PROGRESS:
-      return blink::WebString::fromUTF8("progress");
-    case PP_NACL_EVENT_ERROR:
-      return blink::WebString::fromUTF8("error");
-    case PP_NACL_EVENT_ABORT:
-      return blink::WebString::fromUTF8("abort");
-    case PP_NACL_EVENT_LOAD:
-      return blink::WebString::fromUTF8("load");
-    case PP_NACL_EVENT_LOADEND:
-      return blink::WebString::fromUTF8("loadend");
-    case PP_NACL_EVENT_CRASH:
-      return blink::WebString::fromUTF8("crash");
-  }
-  NOTIMPLEMENTED();
-  return blink::WebString();
-}
-
 static int GetRoutingID(PP_Instance instance) {
   // Check that we are on the main renderer thread.
   DCHECK(content::RenderThread::Get());
@@ -168,14 +146,9 @@ void NexeLoadManager::NexeFileDidOpen(int32_t pp_error,
         nexe_size_);
 
     // Inform JavaScript that we successfully downloaded the nacl module.
-    ProgressEvent progress_event(pp_instance_, PP_NACL_EVENT_PROGRESS, url,
-        true, nexe_size_, nexe_size_);
-    ppapi::PpapiGlobals::Get()->GetMainThreadMessageLoop()->PostTask(
-        FROM_HERE,
-        base::Bind(&NexeLoadManager::DispatchEvent,
-                   weak_factory_.GetWeakPtr(),
-                   progress_event));
-
+    ProgressEvent progress_event(PP_NACL_EVENT_PROGRESS, url, true, nexe_size_,
+                                 nexe_size_);
+    DispatchProgressEvent(pp_instance_, progress_event);
     load_start_ = base::Time::Now();
   }
 }
@@ -197,21 +170,13 @@ void NexeLoadManager::ReportLoadSuccess(const std::string& url,
   set_nacl_ready_state(PP_NACL_READY_STATE_DONE);
 
   // Inform JavaScript that loading was successful and is complete.
-  ProgressEvent load_event(pp_instance_, PP_NACL_EVENT_LOAD, url, true,
-      loaded_bytes, total_bytes);
-  ppapi::PpapiGlobals::Get()->GetMainThreadMessageLoop()->PostTask(
-      FROM_HERE,
-      base::Bind(&NexeLoadManager::DispatchEvent,
-                 weak_factory_.GetWeakPtr(),
-                 load_event));
-
-  ProgressEvent loadend_event(pp_instance_, PP_NACL_EVENT_LOADEND, url, true,
-      loaded_bytes, total_bytes);
-  ppapi::PpapiGlobals::Get()->GetMainThreadMessageLoop()->PostTask(
-      FROM_HERE,
-      base::Bind(&NexeLoadManager::DispatchEvent,
-                 weak_factory_.GetWeakPtr(),
-                 loadend_event));
+  ProgressEvent load_event(PP_NACL_EVENT_LOAD, url, true, loaded_bytes,
+                           total_bytes);
+  DispatchProgressEvent(pp_instance_, load_event);
+
+  ProgressEvent loadend_event(PP_NACL_EVENT_LOADEND, url, true, loaded_bytes,
+                              total_bytes);
+  DispatchProgressEvent(pp_instance_, loadend_event);
 
   // UMA
   HistogramEnumerateLoadStatus(PP_NACL_ERROR_LOAD_SUCCESS, is_installed_);
@@ -245,17 +210,8 @@ void NexeLoadManager::ReportLoadError(PP_NaClError error,
   SetLastError(error_string);
 
   // Inform JavaScript that loading encountered an error and is complete.
-  ppapi::PpapiGlobals::Get()->GetMainThreadMessageLoop()->PostTask(
-      FROM_HERE,
-      base::Bind(&NexeLoadManager::DispatchEvent,
-                 weak_factory_.GetWeakPtr(),
-                 ProgressEvent(PP_NACL_EVENT_ERROR)));
-
-  ppapi::PpapiGlobals::Get()->GetMainThreadMessageLoop()->PostTask(
-      FROM_HERE,
-      base::Bind(&NexeLoadManager::DispatchEvent,
-                 weak_factory_.GetWeakPtr(),
-                 ProgressEvent(PP_NACL_EVENT_LOADEND)));
+  DispatchProgressEvent(pp_instance_, ProgressEvent(PP_NACL_EVENT_ERROR));
+  DispatchProgressEvent(pp_instance_, ProgressEvent(PP_NACL_EVENT_LOADEND));
 
   HistogramEnumerateLoadStatus(error, is_installed_);
   LogToConsole(console_message);
@@ -274,17 +230,8 @@ void NexeLoadManager::ReportLoadAbort() {
   SetLastError(error_string);
 
   // Inform JavaScript that loading was aborted and is complete.
-  ppapi::PpapiGlobals::Get()->GetMainThreadMessageLoop()->PostTask(
-      FROM_HERE,
-      base::Bind(&NexeLoadManager::DispatchEvent,
-                 weak_factory_.GetWeakPtr(),
-                 ProgressEvent(PP_NACL_EVENT_ABORT)));
-
-  ppapi::PpapiGlobals::Get()->GetMainThreadMessageLoop()->PostTask(
-      FROM_HERE,
-      base::Bind(&NexeLoadManager::DispatchEvent,
-                 weak_factory_.GetWeakPtr(),
-                 ProgressEvent(PP_NACL_EVENT_LOADEND)));
+  DispatchProgressEvent(pp_instance_, ProgressEvent(PP_NACL_EVENT_ABORT));
+  DispatchProgressEvent(pp_instance_, ProgressEvent(PP_NACL_EVENT_LOADEND));
 
   HistogramEnumerateLoadStatus(PP_NACL_ERROR_LOAD_ABORTED, is_installed_);
   LogToConsole(error_string);
@@ -321,43 +268,6 @@ void NexeLoadManager::NexeDidCrash(const char* crash_log) {
   CopyCrashLogToJsConsole(crash_log);
 }
 
-void NexeLoadManager::DispatchEvent(const ProgressEvent &event) {
-  blink::WebPluginContainer* container = plugin_instance_->GetContainer();
-  // It's possible that container() is NULL if the plugin has been removed from
-  // the DOM (but the PluginInstance is not destroyed yet).
-  if (!container)
-    return;
-  blink::WebLocalFrame* frame = container->element().document().frame();
-  if (!frame)
-    return;
-  v8::HandleScope handle_scope(plugin_instance_->GetIsolate());
-  v8::Local<v8::Context> context(
-      plugin_instance_->GetIsolate()->GetCurrentContext());
-  if (context.IsEmpty()) {
-    // If there's no JavaScript on the stack, we have to make a new Context.
-    context = v8::Context::New(plugin_instance_->GetIsolate());
-  }
-  v8::Context::Scope context_scope(context);
-
-  if (!event.resource_url.empty()) {
-    blink::WebString url_string = blink::WebString::fromUTF8(
-        event.resource_url.data(), event.resource_url.size());
-    blink::WebDOMResourceProgressEvent blink_event(
-        EventTypeToString(event.event_type),
-        event.length_is_computable,
-        event.loaded_bytes,
-        event.total_bytes,
-        url_string);
-    container->element().dispatchEvent(blink_event);
-  } else {
-    blink::WebDOMProgressEvent blink_event(EventTypeToString(event.event_type),
-                                           event.length_is_computable,
-                                           event.loaded_bytes,
-                                           event.total_bytes);
-    container->element().dispatchEvent(blink_event);
-  }
-}
-
 void NexeLoadManager::set_trusted_plugin_channel(
     scoped_ptr<TrustedPluginChannel> channel) {
   trusted_plugin_channel_ = channel.Pass();
@@ -438,11 +348,8 @@ bool NexeLoadManager::RequestNaClManifest(const std::string& url,
       HistogramEnumerateManifestIsDataURI(*is_data_uri);
 
       set_nacl_ready_state(PP_NACL_READY_STATE_OPENED);
-      ppapi::PpapiGlobals::Get()->GetMainThreadMessageLoop()->PostTask(
-        FROM_HERE,
-        base::Bind(&NexeLoadManager::DispatchEvent,
-                   weak_factory_.GetWeakPtr(),
-                   ProgressEvent(PP_NACL_EVENT_LOADSTART)));
+      DispatchProgressEvent(pp_instance_,
+                            ProgressEvent(PP_NACL_EVENT_LOADSTART));
       return true;
     }
   }
@@ -459,11 +366,7 @@ void NexeLoadManager::ProcessNaClManifest(const std::string& program_url) {
   if (gurl.is_valid())
     is_installed_ = gurl.SchemeIs("chrome-extension");
   set_nacl_ready_state(PP_NACL_READY_STATE_LOADING);
-  ppapi::PpapiGlobals::Get()->GetMainThreadMessageLoop()->PostTask(
-      FROM_HERE,
-      base::Bind(&NexeLoadManager::DispatchEvent,
-                 weak_factory_.GetWeakPtr(),
-                 ProgressEvent(PP_NACL_EVENT_PROGRESS)));
+  DispatchProgressEvent(pp_instance_, ProgressEvent(PP_NACL_EVENT_PROGRESS));
 }
 
 std::string NexeLoadManager::GetManifestURLArgument() const {
@@ -514,11 +417,7 @@ void NexeLoadManager::ReportDeadNexe() {
     SetLastError(message);
     LogToConsole(message);
 
-    ppapi::PpapiGlobals::Get()->GetMainThreadMessageLoop()->PostTask(
-        FROM_HERE,
-        base::Bind(&NexeLoadManager::DispatchEvent,
-                   weak_factory_.GetWeakPtr(),
-                   ProgressEvent(PP_NACL_EVENT_CRASH)));
+    DispatchProgressEvent(pp_instance_, ProgressEvent(PP_NACL_EVENT_CRASH));
     nexe_error_reported_ = true;
   }
   // else ReportLoadError() and ReportLoadAbort() will be used by loading code
diff --git a/components/nacl/renderer/nexe_load_manager.h b/components/nacl/renderer/nexe_load_manager.h
index ed9dca94..878e1ab 100644
--- a/components/nacl/renderer/nexe_load_manager.h
+++ b/components/nacl/renderer/nexe_load_manager.h
@@ -52,31 +52,6 @@ class NexeLoadManager {
   // The intent is for this class to only expose functions for reporting a
   // load state transition (e.g., ReportLoadError, ReportProgress,
   // ReportLoadAbort, etc.)
-  struct ProgressEvent {
-    explicit ProgressEvent(PP_NaClEventType event_type_param)
-        : event_type(event_type_param),
-          length_is_computable(false),
-          loaded_bytes(0),
-          total_bytes(0) {
-    }
-    ProgressEvent(PP_Instance instance, PP_NaClEventType event_type,
-                  const std::string& resource_url, bool length_is_computable,
-                  uint64_t loaded_bytes, uint64_t total_bytes)
-        : instance(instance),
-          event_type(event_type),
-          resource_url(resource_url),
-          length_is_computable(length_is_computable),
-          loaded_bytes(loaded_bytes),
-          total_bytes(total_bytes) {
-    }
-    PP_Instance instance;
-    PP_NaClEventType event_type;
-    std::string resource_url;
-    bool length_is_computable;
-    uint64_t loaded_bytes;
-    uint64_t total_bytes;
-  };
-  void DispatchEvent(const ProgressEvent &event);
   void set_trusted_plugin_channel(scoped_ptr<TrustedPluginChannel> channel);
   void set_manifest_service_channel(
       scoped_ptr<ManifestServiceChannel> channel);
diff --git a/components/nacl/renderer/ppb_nacl_private_impl.cc b/components/nacl/renderer/ppb_nacl_private_impl.cc
index e9efc6b..2623e28 100644
--- a/components/nacl/renderer/ppb_nacl_private_impl.cc
+++ b/components/nacl/renderer/ppb_nacl_private_impl.cc
@@ -26,6 +26,7 @@
 #include "components/nacl/renderer/manifest_service_channel.h"
 #include "components/nacl/renderer/nexe_load_manager.h"
 #include "components/nacl/renderer/pnacl_translation_resource_host.h"
+#include "components/nacl/renderer/progress_event.h"
 #include "components/nacl/renderer/sandbox_arch.h"
 #include "components/nacl/renderer/trusted_plugin_channel.h"
 #include "content/public/common/content_client.h"
@@ -654,48 +655,18 @@ PP_FileHandle OpenNaClExecutable(PP_Instance instance,
   return handle;
 }
 
-void DispatchEventOnMainThread(PP_Instance instance,
-                               PP_NaClEventType event_type,
-                               const std::string& resource_url,
-                               PP_Bool length_is_computable,
-                               uint64_t loaded_bytes,
-                               uint64_t total_bytes);
-
 void DispatchEvent(PP_Instance instance,
                    PP_NaClEventType event_type,
                    const char *resource_url,
                    PP_Bool length_is_computable,
                    uint64_t loaded_bytes,
                    uint64_t total_bytes) {
-  ppapi::PpapiGlobals::Get()->GetMainThreadMessageLoop()->PostTask(
-      FROM_HERE,
-      base::Bind(&DispatchEventOnMainThread,
-                 instance,
-                 event_type,
-                 std::string(resource_url),
-                 length_is_computable,
-                 loaded_bytes,
-                 total_bytes));
-}
-
-void DispatchEventOnMainThread(PP_Instance instance,
-                               PP_NaClEventType event_type,
-                               const std::string& resource_url,
-                               PP_Bool length_is_computable,
-                               uint64_t loaded_bytes,
-                               uint64_t total_bytes) {
-  NexeLoadManager* load_manager =
-      GetNexeLoadManager(instance);
-  // The instance may have been destroyed after we were scheduled, so do
-  // nothing if it's gone.
-  if (load_manager) {
-    NexeLoadManager::ProgressEvent event(event_type);
-    event.resource_url = resource_url;
-    event.length_is_computable = PP_ToBool(length_is_computable);
-    event.loaded_bytes = loaded_bytes;
-    event.total_bytes = total_bytes;
-    load_manager->DispatchEvent(event);
-  }
+  ProgressEvent event(event_type,
+                      resource_url,
+                      PP_ToBool(length_is_computable),
+                      loaded_bytes,
+                      total_bytes);
+  DispatchProgressEvent(instance, event);
 }
 
 void NexeFileDidOpen(PP_Instance instance,
diff --git a/components/nacl/renderer/progress_event.cc b/components/nacl/renderer/progress_event.cc
new file mode 100644
index 0000000..1e05366
--- /dev/null
+++ b/components/nacl/renderer/progress_event.cc
@@ -0,0 +1,97 @@
+// 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.
+
+#include "components/nacl/renderer/progress_event.h"
+
+#include "base/bind.h"
+#include "base/location.h"
+#include "base/logging.h"
+#include "base/message_loop/message_loop_proxy.h"
+#include "content/public/renderer/pepper_plugin_instance.h"
+#include "ppapi/c/private/ppb_nacl_private.h"
+#include "ppapi/shared_impl/ppapi_globals.h"
+#include "third_party/WebKit/public/platform/WebString.h"
+#include "third_party/WebKit/public/web/WebDOMResourceProgressEvent.h"
+#include "third_party/WebKit/public/web/WebDocument.h"
+#include "third_party/WebKit/public/web/WebElement.h"
+#include "third_party/WebKit/public/web/WebLocalFrame.h"
+#include "third_party/WebKit/public/web/WebPluginContainer.h"
+#include "v8/include/v8.h"
+
+namespace nacl {
+
+namespace {
+blink::WebString EventTypeToString(PP_NaClEventType event_type) {
+  switch (event_type) {
+    case PP_NACL_EVENT_LOADSTART:
+      return blink::WebString::fromUTF8("loadstart");
+    case PP_NACL_EVENT_PROGRESS:
+      return blink::WebString::fromUTF8("progress");
+    case PP_NACL_EVENT_ERROR:
+      return blink::WebString::fromUTF8("error");
+    case PP_NACL_EVENT_ABORT:
+      return blink::WebString::fromUTF8("abort");
+    case PP_NACL_EVENT_LOAD:
+      return blink::WebString::fromUTF8("load");
+    case PP_NACL_EVENT_LOADEND:
+      return blink::WebString::fromUTF8("loadend");
+    case PP_NACL_EVENT_CRASH:
+      return blink::WebString::fromUTF8("crash");
+  }
+  NOTIMPLEMENTED();
+  return blink::WebString();
+}
+
+void DispatchProgressEventOnMainThread(PP_Instance instance,
+                                       const ProgressEvent &event) {
+  content::PepperPluginInstance* plugin_instance =
+      content::PepperPluginInstance::Get(instance);
+  if (!plugin_instance)
+    return;
+
+  blink::WebPluginContainer* container = plugin_instance->GetContainer();
+  // It's possible that container() is NULL if the plugin has been removed from
+  // the DOM (but the PluginInstance is not destroyed yet).
+  if (!container)
+    return;
+  blink::WebLocalFrame* frame = container->element().document().frame();
+  if (!frame)
+    return;
+  v8::HandleScope handle_scope(plugin_instance->GetIsolate());
+  v8::Local<v8::Context> context(
+      plugin_instance->GetIsolate()->GetCurrentContext());
+  if (context.IsEmpty()) {
+    // If there's no JavaScript on the stack, we have to make a new Context.
+    context = v8::Context::New(plugin_instance->GetIsolate());
+  }
+  v8::Context::Scope context_scope(context);
+
+  if (!event.resource_url.empty()) {
+    blink::WebString url_string = blink::WebString::fromUTF8(
+        event.resource_url.data(), event.resource_url.size());
+    blink::WebDOMResourceProgressEvent blink_event(
+        EventTypeToString(event.event_type),
+        event.length_is_computable,
+        event.loaded_bytes,
+        event.total_bytes,
+        url_string);
+    container->element().dispatchEvent(blink_event);
+  } else {
+    blink::WebDOMProgressEvent blink_event(EventTypeToString(event.event_type),
+                                           event.length_is_computable,
+                                           event.loaded_bytes,
+                                           event.total_bytes);
+    container->element().dispatchEvent(blink_event);
+  }
+}
+
+}  // namespace
+
+void DispatchProgressEvent(PP_Instance instance, const ProgressEvent &event) {
+  ppapi::PpapiGlobals::Get()->GetMainThreadMessageLoop()->PostTask(
+      FROM_HERE,
+      base::Bind(&DispatchProgressEventOnMainThread, instance, event));
+}
+
+}  // namespace nacl
diff --git a/components/nacl/renderer/progress_event.h b/components/nacl/renderer/progress_event.h
new file mode 100644
index 0000000..53be606
--- /dev/null
+++ b/components/nacl/renderer/progress_event.h
@@ -0,0 +1,53 @@
+// 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.
+
+#ifndef COMPONENTS_NACL_RENDERER_NEXE_PROGRESS_EVENT_H_
+#define COMPONENTS_NACL_RENDERER_NEXE_PROGRESS_EVENT_H_
+
+#include <string>
+
+#include "ppapi/c/pp_instance.h"
+#include "ppapi/c/private/ppb_nacl_private.h"
+
+namespace nacl {
+
+// See http://www.w3.org/TR/progress-events/ for more details on progress
+// events.
+struct ProgressEvent {
+  explicit ProgressEvent(PP_NaClEventType event_type_param)
+      : event_type(event_type_param),
+        length_is_computable(false),
+        loaded_bytes(0),
+        total_bytes(0) {
+  }
+
+  ProgressEvent(PP_NaClEventType event_type_param,
+                const std::string& resource_url_param,
+                bool length_is_computable_param,
+                uint64_t loaded_bytes_param,
+                uint64_t total_bytes_param)
+      : event_type(event_type_param),
+        resource_url(resource_url_param),
+        length_is_computable(length_is_computable_param),
+        loaded_bytes(loaded_bytes_param),
+        total_bytes(total_bytes_param) {
+  }
+
+  PP_NaClEventType event_type;
+  std::string resource_url;
+  bool length_is_computable;
+  uint64_t loaded_bytes;
+  uint64_t total_bytes;
+};
+
+// Dispatches a progress event to the DOM frame corresponding to the specified
+// plugin instance.
+// This posts a task to the main thread to perform the actual dispatch, since
+// it's usually intended for progress events to be dispatched after all other
+// state changes are handled.
+void DispatchProgressEvent(PP_Instance instance, const ProgressEvent& event);
+
+}  // namespace nacl
+
+#endif  // COMPONENTS_NACL_RENDERER_NEXE_PROGRESS_EVENT_H_