AU: Send board (e.g. x86-generic) to update server in query.

BUG=None
TEST=Attached Unittests

Review URL: http://codereview.chromium.org/2827032
diff --git a/update_check_action_unittest.cc b/update_check_action_unittest.cc
index c730b40..e2e7410 100644
--- a/update_check_action_unittest.cc
+++ b/update_check_action_unittest.cc
@@ -159,6 +159,7 @@
                            UpdateCheckParams::kOsPlatform,
                            UpdateCheckParams::kOsVersion,
                            "",  // os_sp
+                           "x86-generic",
                            UpdateCheckParams::kAppId,
                            "0.1.0.0",
                            "en-US",
@@ -180,6 +181,7 @@
                            UpdateCheckParams::kOsPlatform,
                            UpdateCheckParams::kOsVersion,
                            "service_pack",
+                           "arm-generic",
                            UpdateCheckParams::kAppId,
                            "0.1.0.0",
                            "en-US",
@@ -215,6 +217,7 @@
                            UpdateCheckParams::kOsPlatform,
                            UpdateCheckParams::kOsVersion,
                            "",  // os_sp
+                           "",  // os_board
                            UpdateCheckParams::kAppId,
                            "0.1.0.0",
                            "en-US",
@@ -248,6 +251,7 @@
                            UpdateCheckParams::kOsPlatform,
                            UpdateCheckParams::kOsVersion,
                            "service_pack",
+                           "x86-generic",
                            UpdateCheckParams::kAppId,
                            "0.1.0.0",
                            "en-US",
@@ -269,6 +273,7 @@
                            UpdateCheckParams::kOsPlatform,
                            UpdateCheckParams::kOsVersion,
                            "service_pack",
+                           "x86-generic",
                            UpdateCheckParams::kAppId,
                            "0.1.0.0",
                            "en-US",
@@ -293,6 +298,7 @@
                            UpdateCheckParams::kOsPlatform,
                            UpdateCheckParams::kOsVersion,
                            "service_pack",
+                           "x86-generic",
                            UpdateCheckParams::kAppId,
                            "0.1.0.0",
                            "en-US",
@@ -317,6 +323,7 @@
                            UpdateCheckParams::kOsPlatform,
                            UpdateCheckParams::kOsVersion,
                            "service_pack",
+                           "x86-generic",
                            UpdateCheckParams::kAppId,
                            "0.1.0.0",
                            "en-US",
@@ -341,6 +348,7 @@
                            UpdateCheckParams::kOsPlatform,
                            UpdateCheckParams::kOsVersion,
                            "service_pack",
+                           "x86-generic",
                            UpdateCheckParams::kAppId,
                            "0.1.0.0",
                            "en-US",
@@ -400,6 +408,7 @@
                            UpdateCheckParams::kOsPlatform,
                            UpdateCheckParams::kOsVersion,
                            "",  // os_sp
+                           "",  // os_board
                            UpdateCheckParams::kAppId,
                            "0.1.0.0",
                            "en-US",
@@ -440,6 +449,7 @@
                            UpdateCheckParams::kOsPlatform,
                            UpdateCheckParams::kOsVersion,
                            "testtheservice_pack>",
+                           "x86 generic",
                            UpdateCheckParams::kAppId,
                            "0.1.0.0",
                            "en-US",
@@ -460,6 +470,7 @@
   EXPECT_EQ(post_str.find("testtheuser_id<"), string::npos);
   EXPECT_NE(post_str.find("testtheservice_pack>"), string::npos);
   EXPECT_EQ(post_str.find("testtheservice_pack>"), string::npos);
+  EXPECT_NE(post_str.find("x86 generic"), string::npos);
 }
 
 TEST(UpdateCheckActionTest, XmlDecodeTest) {
@@ -468,6 +479,7 @@
                            UpdateCheckParams::kOsPlatform,
                            UpdateCheckParams::kOsVersion,
                            "service_pack",
+                           "x86-generic",
                            UpdateCheckParams::kAppId,
                            "0.1.0.0",
                            "en-US",
@@ -498,6 +510,7 @@
                            UpdateCheckParams::kOsPlatform,
                            UpdateCheckParams::kOsVersion,
                            "service_pack",
+                           "the_board",
                            UpdateCheckParams::kAppId,
                            "0.1.0.0",
                            "en-US",