Browser Plugin: Implement Back, Forward, and Go.

content/renderer/browser_plugin/browser_plugin_bindings.cc

Index: content/renderer/browser_plugin/browser_plugin_bindings.cc
diff --git a/content/renderer/browser_plugin/browser_plugin_bindings.cc b/content/renderer/browser_plugin/browser_plugin_bindings.cc
index d8c75ad5bece01eaafc258f690db6a230278023b..0e00bfe3f423710863a5efc742d1f6a2aa5bbfe8 100644
--- a/content/renderer/browser_plugin/browser_plugin_bindings.cc
+++ b/content/renderer/browser_plugin/browser_plugin_bindings.cc
@@ -8,7 +8,6 @@
 #include <string>
 
 #include "base/bind.h"
-#include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/string16.h"
 #include "base/string_split.h"
@@ -39,6 +38,9 @@ namespace content {
 namespace {
 
 const char kAddEventListener[] = "addEventListener";
+const char kBackMethod[] = "back";
+const char kForwardMethod[] = "forward";
+const char kGoMethod[] = "go";
 const char kRemoveEventListener[] = "removeEventListener";
 const char kSrcAttribute[] = "src";
 
@@ -51,6 +53,18 @@ bool IdentifierIsAddEventListener(NPIdentifier identifier) {
   return WebBindings::getStringIdentifier(kAddEventListener) == identifier;
 }
 
+bool IdentifierIsBackMethod(NPIdentifier identifier) {
+  return WebBindings::getStringIdentifier(kBackMethod) == identifier;
+}
+
+bool IdentifierIsForwardMethod(NPIdentifier identifier) {
+  return WebBindings::getStringIdentifier(kForwardMethod) == identifier;
+}
+
+bool IdentifierIsGoMethod(NPIdentifier identifier) {
+  return WebBindings::getStringIdentifier(kGoMethod) == identifier;
+}
+
 bool IdentifierIsRemoveEventListener(NPIdentifier identifier) {
   return WebBindings::getStringIdentifier(kRemoveEventListener) == identifier;
 }
@@ -59,6 +73,16 @@ bool IdentifierIsSrcAttribute(NPIdentifier identifier) {
   return WebBindings::getStringIdentifier(kSrcAttribute) == identifier;
 }
 
+int Int32FromNPVariant(const NPVariant& variant) {
+  if (NPVARIANT_IS_INT32(variant))
+    return NPVARIANT_TO_INT32(variant);
+
+  if (NPVARIANT_IS_DOUBLE(variant))
+    return NPVARIANT_TO_DOUBLE(variant);
+
+  return 0;
+}
+
 std::string StringFromNPVariant(const NPVariant& variant) {
   if (!NPVARIANT_IS_STRING(variant))
     return std::string();
@@ -109,6 +133,15 @@ bool BrowserPluginBindingsHasMethod(NPObject* np_obj, NPIdentifier name) {
   if (IdentifierIsAddEventListener(name))
     return true;
 
+  if (IdentifierIsBackMethod(name))
+    return true;
+
+  if (IdentifierIsForwardMethod(name))
+    return true;
+
+  if (IdentifierIsGoMethod(name))
+    return true;
+
   if (IdentifierIsRemoveEventListener(name))
     return true;
 
@@ -139,6 +172,21 @@ bool BrowserPluginBindingsInvoke(NPObject* np_obj, NPIdentifier name,
     return bindings->instance()->AddEventListener(event_name, function);
   }
 
+  if (IdentifierIsBackMethod(name) && !arg_count) {
+    bindings->instance()->Back();
+    return true;
+  }
+
+  if (IdentifierIsForwardMethod(name) && !arg_count) {
+    bindings->instance()->Forward();
+    return true;
+  }
+
+  if (IdentifierIsGoMethod(name) && arg_count == 1) {
+    bindings->instance()->Go(Int32FromNPVariant(args[0]));
+    return true;
+  }
+
   if (IdentifierIsRemoveEventListener(name) && arg_count == 2) {
     std::string event_name = StringFromNPVariant(args[0]);
     if (event_name.empty())
@@ -174,10 +222,6 @@ bool BrowserPluginBindingsGetProperty(NPObject* np_obj, NPIdentifier name,
   if (!np_obj)
     return false;
 
-  if (IdentifierIsAddEventListener(name) ||
-      IdentifierIsRemoveEventListener(name))
-    return false;
-
   if (IdentifierIsSrcAttribute(name)) {
     BrowserPluginBindings* bindings = GetBindings(np_obj);
     if (!bindings)