Silicon Valley's tech industry continues to struggle with gender diversity in the workforce. Many of the biggest names in tech, including Google (NASDAQ: GOOG), Facebook (NYSE: FB) and Apple (NASDAQ: AAPL), have disproportionately male workforces, a disparity that's even more pronounced in technical roles. Trending: Meet the Bay Area's top 25 women-owned businesses for 2017 At Google, for example, 32 percent of the overall workforce is female and just 20 percent of its engineering and technical…