Corporations can't donate to political campaigns. What OpenSecrets.org misleadingly advertises as "corporate" donations to political campaigns are employee donations to campaigns.[1] Google has 57,000 employees. Unsurprisingly, many of them exercise their rights as members of a democracy and support their favorite political candidates.
[1] Specifically, OpenSecrets lists donations from individual employees and company-sponsored PACs. Corporations are banned from contributing directly to political candidates, or from donating to regular PACs. Only Super PACs can accept money from corporations, but those are banned from donating to candidates.