Do not calculate composition bounds until IME requests.

content/browser/renderer_host/ime_adapter_android.cc

Index: content/browser/renderer_host/ime_adapter_android.cc
diff --git a/content/browser/renderer_host/ime_adapter_android.cc b/content/browser/renderer_host/ime_adapter_android.cc
index 92b3346747006bb3ccefa7a4477b55df70496d7a..7731982d454507f24301ecf79be58debe0a6ada5 100644
--- a/content/browser/renderer_host/ime_adapter_android.cc
+++ b/content/browser/renderer_host/ime_adapter_android.cc
@@ -328,6 +328,14 @@ bool ImeAdapterAndroid::RequestTextInputStateUpdate(
   return true;
 }
 
+void ImeAdapterAndroid::RequestCursorUpdate(
+    JNIEnv* env, const base::android::JavaParamRef<jobject>& obj, int mode) {
+  RenderWidgetHostImpl* rwhi = GetRenderWidgetHostImpl();
+  if (!rwhi)
+    return;
+  rwhi->Send(new InputMsg_RequestCursorUpdate(rwhi->GetRoutingID(), mode));
+}
+
 bool ImeAdapterAndroid::IsImeThreadEnabled(
     JNIEnv* env,
     const base::android::JavaParamRef<jobject>&) {