Merge "Wait for the profile to not be empty in BootImageProfileTest"

        String res;

        res = mTestDevice.executeShellCommand("truncate -s 0 " + SYSTEM_SERVER_PROFILE).trim();

        assertTrue(res, res.length() == 0);

        // Force save profiles in case the system just started.

        Thread.sleep(1000);

        // Wait up to 20 seconds for the profile to be saved.

        for (int i = 0; i < 20; ++i) {

            // Force save the profile since we truncated it.

            forceSaveProfile("system_server");

        Thread.sleep(2000);

            String s = mTestDevice.executeShellCommand("wc -c <" + SYSTEM_SERVER_PROFILE).trim();

            if (!"0".equals(s)) {

                break;

            }

            Thread.sleep(1000);

        }

        // In case the profile is partially saved, wait an extra second.

        Thread.sleep(1000);

        // Validate that the profile is non empty.

        res = mTestDevice.executeShellCommand("profman --dump-only --profile-file="

                + SYSTEM_SERVER_PROFILE);