SkQP: Refactor Java method SkQP.runTests()

Since it was only called by SkQPActivity.run(), I simply moved the code
into that method.

CQ_INCLUDE_TRYBOTS=skia.primary:Build-Debian9-Clang-x86-devrel-Android_SKQP,Test-Debian9-Clang-NUC7i5BNK-CPU-Emulator-x86-devrel-All-Android_SKQP

Change-Id: I82ef407dd440fa94e4c01c0f21a76389793ece58
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/225177
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
Auto-Submit: Hal Canary <halcanary@google.com>
2 files changed