[IME] Supports options page for each IME instead of single options page for each IME extension.

chrome/common/extensions/api/input_ime/input_components_handler.cc

Index: chrome/common/extensions/api/input_ime/input_components_handler.cc
diff --git a/chrome/common/extensions/api/input_ime/input_components_handler.cc b/chrome/common/extensions/api/input_ime/input_components_handler.cc
index 67a1c95d9374a1ea12016d6fabf22f14814d0cf0..2fe6bf006708e8bc847a6fbb9b67cdbf23f3f8af 100644
--- a/chrome/common/extensions/api/input_ime/input_components_handler.cc
+++ b/chrome/common/extensions/api/input_ime/input_components_handler.cc
@@ -64,6 +64,7 @@ bool InputComponentsHandler::Parse(Extension* extension,
     std::set<std::string> layouts;
     std::string shortcut_keycode_str;
     GURL input_view_url;
+    GURL options_page_url;
     bool shortcut_alt = false;
     bool shortcut_ctrl = false;
     bool shortcut_shift = false;
@@ -194,6 +195,22 @@ bool InputComponentsHandler::Parse(Extension* extension,
       }
     }
 
+    // Get input_components[i].options_page_url.
+    // Note: 'options_page' is optional in manifest.
+    std::string options_page_str;
+    if (module_value->GetString(keys::kImeOptionsPage, &options_page_str)) {
+      options_page_url = extension->GetResourceURL(options_page_str);
+      if (!options_page_url.is_valid()) {
+        *error = ErrorUtils::FormatErrorMessageUTF16(
+            errors::kInvalidOptionsPage,
+            base::IntToString(i));
+        return false;
+      }
+    } else {
+      // Fall back to extension's options page for backward compatibility.
+      options_page_url = extensions::ManifestURL::GetOptionsPage(extension);
+    }
+
     info->input_components.push_back(InputComponentInfo());
     info->input_components.back().name = name_str;
     info->input_components.back().type = type;
@@ -206,8 +223,7 @@ bool InputComponentsHandler::Parse(Extension* extension,
     info->input_components.back().shortcut_alt = shortcut_alt;
     info->input_components.back().shortcut_ctrl = shortcut_ctrl;
     info->input_components.back().shortcut_shift = shortcut_shift;
-    info->input_components.back().options_page_url =
-        extensions::ManifestURL::GetOptionsPage(extension);
+    info->input_components.back().options_page_url = options_page_url;
     info->input_components.back().input_view_url = input_view_url;
   }
   extension->SetManifestData(keys::kInputComponents, info.release());