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This CL adds a few more tests to app_shell_browsertests:
WebViewAPITest.TestAllowTransparencyAttribute
WebViewAPITest.TestAutosizeAfterNavigation
WebViewAPITest.TestAutosizeBeforeNavigation
WebViewAPITest.TestAutosizeHeight
WebViewAPITest.TestAutosizeRemoveAttributes
WebViewAPITest.TestAutosizeWithPartialAttributes

BUG=352293

Review URL: https://codereview.chromium.org/604443003

Cr-Commit-Position: refs/heads/master@{#296570}