internal.infra.codesearch builder gen bot failed at compile step:

https://uberchromegw.corp.google.com/i/internal.infra.codesearch/builders/codesearch-gen-clankium-android/builds/121/steps/compile/logs/stdio

util.build_utils.CalledProcessError: Command failed: ( cd /b/build/slave/codesearch-gen-clankium-android/build/src/out/Debug; ../../third_party/android_tools/sdk/build-tools/26.0.0/dx -JXmx2G --num-threads=8 --dex --force-jumbo --output gen/chrome/android/webapk/shell_apk/javatests/canary_lib/canary2.dex lib.java/chrome/android/webapk/shell_apk/javatests/canary_lib/canary_lib2_java.jar )
Exception in thread "main" java.lang.UnsupportedClassVersionError: com/android/dx/command/Main : Unsupported major.minor version 52.0
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:803)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:442)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:64)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:354)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:348)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:347)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:312)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
	at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)



This type of error is caused by mixing Java 7 and 8. Now the bot needs to be added to our java8 whitelist, e.g. https://chrome-internal-review.googlesource.com/c/412649/