Build chrome.input.ime.* API in GN mode.

chrome/browser/extensions/BUILD.gn

Index: chrome/browser/extensions/BUILD.gn
diff --git a/chrome/browser/extensions/BUILD.gn b/chrome/browser/extensions/BUILD.gn
index 95f44e0e0ad27fbe7ed30f0407f907410828d257..557b55989464e1bed8c01d646584aac33ff86432 100644
--- a/chrome/browser/extensions/BUILD.gn
+++ b/chrome/browser/extensions/BUILD.gn
@@ -150,6 +150,12 @@ source_set("extensions") {
         "//ui/events/platform/x11",
       ]
     }
+    if (!is_chromeos) {
+      sources += rebase_path(
+              gypi_values.chrome_browser_extensions_input_ime_linux_win_sources,
+              ".",
+              "//chrome")
+    }
   }
 
   if (enable_configuration_policy) {
@@ -200,6 +206,10 @@ source_set("extensions") {
       "//third_party/iaccessible2",
       "//third_party/isimpledom",
     ]
+    sources += rebase_path(
+            gypi_values.chrome_browser_extensions_input_ime_linux_win_sources,
+            ".",
+            "//chrome")
   } else if (use_aura && !is_chromeos) {
     sources += [
       "display_info_provider_aura.cc",