Add an end-to-end test for sign-in profile apps installation

chrome/test/data/extensions/trivial_platform_app/app.pem

Index: chrome/test/data/extensions/trivial_platform_app/app.pem
diff --git a/chrome/test/data/extensions/trivial_platform_app/app.pem b/chrome/test/data/extensions/trivial_platform_app/app.pem
new file mode 100644
index 0000000000000000000000000000000000000000..8694cc722c90c1b3b6b41a1ace0e4e7c30210d07
--- /dev/null
+++ b/chrome/test/data/extensions/trivial_platform_app/app.pem
@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDg1G8BXj5b4ZZm
+pq4e/YWMLrahLD+0XJLqqlStXZV1jAQilXO1pbMsBfNS2p+MpgKaoFPtAD+95kJV
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+Rfm3OzFXAgMBAAECggEACN/53cj1lzTpdfXga7LAQc9aQDR580mwNvkwTIOkMbas
+Nx1FKwd2cidt+nhM0gV/ltD7XyCiY4GiXrODPjoFchSv15DYioXkhGvHwrPYuk+V
+dr+wUSpDfWuZrzLW0LExazpAuXDA6YIuQ4AKC6C4zZZZRadDYB2dqPaLTuR4DGjQ
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+h8oZtlRsmufx44tlxcguY4Zunv5RRQ+MYwgtFhrW+QKBgQDwiUZ/9OuABWtnwD6P
+2iRoi0hGv5V0a2kQSejvLjaDDF4izyREKcUBF8CieuZODhN5J1ua+bmNJcrFAFJ+
+bgmDN8uLueheJ3nloUQ4b9UM9tXniF+cTbaakDt2gNTpE8/IPOW9iVHwErDnBBSa
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+iZEGw3yFdBXk5efC15jU674/oxWqZfu5X6fxNpbso88TRnVrxfJAz05vppeCtbt2
+blmgG4veD/RrzlIJCHEpr3yDCSb/R4W5eiCMfRw5WVUBdmItLloTE22nAoGBANuS
+SBbxhwshbm8tU5Tef5tDVMwdfMxn1VHuY+m86HpVaVo/083GluFII67ddaE1bVV5
+Yibrs/3ifxKr1sEAfkZO1InE+SUaXm92TJMoZryO0gI5dvj3/zjnx67b8WYd2wC0
+ee5knzrGSotyeGIYBzUompAlJHTktmLD0CoxH2DpAoGBAJhdbttjro8o7x+63Q40
+fsHA0Wk9mzEAKHTOeQg1P1YIXBVhjkKJyhpioT8y3eV3rFVVY0Leq6vE9st+omuR
+BE/rcMqv/R+IIVdKiX8JDkcFRKR+fi5mZMvdz+xbSHo8pc2CeoL3KvbLR1+caIUQ
+A/6ko09GAb5+BqFXjjDS6EL9
+-----END PRIVATE KEY-----