The question of whether or not meals furnished by an employer to an employee are a form of compensation that is taxable income to the employee is neither new, nor difficult.
The issue was determined by litigation before WWII and in 1954 the rule that had evolved was added to the Internal Revenue Code as Section 119:
"There shall be excluded from gross income of an employee the value of any meals ... furnished to him ... by ... his employer for the convenience of the employer, but only if -- ... the meals are furnished on the business premises of the employer ..."
The IRS issued a written interpretation of this provision with several examples almost 50 years ago.
Examples of tax free meals include those furnished a remote construction site camp and those furnished to hospital workers who need to stay on site in order to be available for emergency calls. The following example is not tax free:
"A manufacturing company provides a cafeteria on its premises at which its employees can purchase their lunch. There is no other eating facility located near the company's premises, but the employee can furnish his own meal by bringing his lunch. The amount of compensation which any employee is required to include in gross income is not reduced by the amount charged for the meals, and the meals are not considered to be furnished for the convenience of the employer."
Without more research into the facts and circumstances of Google and its employees, I think that the above example would control their situation, and that the meals would be taxable income to their employees.
BTW: The IRS does not consider coffee, donuts, and soft drinks served at meetings or in break rooms to be taxable income in most situations
These rules are derived from the basic interpretation by the Supreme Court and the IRS of the phrase "income from whatever source derived" used in Amendment XVI to the Constitution and in the Internal Revenue Code. These rules have been consistent during the century since Am. 16 and the Income Tax were adopted.
I have spent some time and effort in researching and reading ideas on tax reform over the years since I first began to study the income tax 40 years ago, and I have not seen anything that would result in a change to this rule that would make meals non-taxable in all circumstances.