move graph package to sdk 26

Test: make RunSettingsRoboTests -j40
Change-Id: I0a48b7c186aa6e35f08e46bc7af06d6a4d83af18
diff --git a/tests/robotests/src/com/android/settings/graph/BottomLabelLayoutTest.java b/tests/robotests/src/com/android/settings/graph/BottomLabelLayoutTest.java
index c9804d6..eef6921 100644
--- a/tests/robotests/src/com/android/settings/graph/BottomLabelLayoutTest.java
+++ b/tests/robotests/src/com/android/settings/graph/BottomLabelLayoutTest.java
@@ -35,7 +35,7 @@
 import org.robolectric.annotation.Config;
 
 @RunWith(RobolectricTestRunner.class)
-@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION_O)
 public class BottomLabelLayoutTest {
     private BottomLabelLayout mBottomLabelLayout;
     private Context mContext;
diff --git a/tests/robotests/src/com/android/settings/graph/UsageGraphTest.java b/tests/robotests/src/com/android/settings/graph/UsageGraphTest.java
index fbd6fd4..4ab3381 100644
--- a/tests/robotests/src/com/android/settings/graph/UsageGraphTest.java
+++ b/tests/robotests/src/com/android/settings/graph/UsageGraphTest.java
@@ -37,7 +37,7 @@
 import org.robolectric.annotation.Config;
 
 @RunWith(RobolectricTestRunner.class)
-@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION_O)
 public class UsageGraphTest {
     private UsageGraph mGraph;