public Builder requestHandlerBuilder(RequestHandler.Builder builder) {
      this.builder = builder;
      this.exceptionsAllowedToRetry.add(OverQueryLimitException.class);
      return this;
    }
Changes the RequestHandler.Builder strategy to change between the {@code
OkHttpRequestHandler} and the {@code GaeRequestHandler}.

@param builder The {@code RequestHandler.Builder} to use for {@link #build()}
@return Returns this builder for call chaining.
@see OkHttpRequestHandler
@see GaeRequestHandler
src/main/java/com/google/maps/GeoApiContext.java