Add Checker Framework to dependencies.

This CL doesn't *use* any annotations yet, and I'm not even certain that we're going to yet. But I think we're likely to, and there's enough that can go wrong with just this step that I'd like to get it in.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=176584793

android/guava-testlib/pom.xml

@@ -18,6 +18,10 @@
       <groupId>com.google.code.findbugs</groupId>
       <artifactId>jsr305</artifactId>
     </dependency>
+    <dependency>
+      <groupId>org.checkerframework</groupId>
+      <artifactId>checker-qual</artifactId>
+    </dependency>
     <dependency>
       <groupId>com.google.errorprone</groupId>
       <artifactId>error_prone_annotations</artifactId>

android/guava-tests/pom.xml

@@ -25,6 +25,10 @@
       <groupId>com.google.code.findbugs</groupId>
       <artifactId>jsr305</artifactId>
     </dependency>
+    <dependency>
+      <groupId>org.checkerframework</groupId>
+      <artifactId>checker-qual</artifactId>
+    </dependency>
     <dependency>
       <groupId>com.google.errorprone</groupId>
       <artifactId>error_prone_annotations</artifactId>

android/guava/pom.xml

@@ -20,6 +20,10 @@
       <groupId>com.google.code.findbugs</groupId>
       <artifactId>jsr305</artifactId>
     </dependency>
+    <dependency>
+      <groupId>org.checkerframework</groupId>
+      <artifactId>checker-qual</artifactId>
+    </dependency>
     <dependency>
       <groupId>com.google.errorprone</groupId>
       <artifactId>error_prone_annotations</artifactId>
@@ -130,6 +134,7 @@
           </offlineLinks>
           <links>
             <link>http://errorprone.info/api/latest/</link>
+            <link>https://checkerframework.org/api/</link>
           </links>
           <!-- TODO(cpovirk): can we use includeDependencySources and a local com.oracle.java:jdk-lib:noversion:sources instead of all this unzipping and manual sourcepath modification? -->
           <!-- (We need JDK *sources*, not just -link, so that {@inheritDoc} works.) -->

android/pom.xml

@@ -223,6 +223,11 @@
         <artifactId>jsr305</artifactId>
         <version>1.3.9</version>
       </dependency>
+      <dependency>
+        <groupId>org.checkerframework</groupId>
+        <artifactId>checker-qual</artifactId>
+        <version>2.0.0</version>
+      </dependency>
       <dependency>
         <groupId>com.google.errorprone</groupId>
         <artifactId>error_prone_annotations</artifactId>

guava-testlib/pom.xml

@@ -18,6 +18,10 @@
       <groupId>com.google.code.findbugs</groupId>
       <artifactId>jsr305</artifactId>
     </dependency>
+    <dependency>
+      <groupId>org.checkerframework</groupId>
+      <artifactId>checker-qual</artifactId>
+    </dependency>
     <dependency>
       <groupId>com.google.errorprone</groupId>
       <artifactId>error_prone_annotations</artifactId>

guava-tests/pom.xml

@@ -25,6 +25,10 @@
       <groupId>com.google.code.findbugs</groupId>
       <artifactId>jsr305</artifactId>
     </dependency>
+    <dependency>
+      <groupId>org.checkerframework</groupId>
+      <artifactId>checker-qual</artifactId>
+    </dependency>
     <dependency>
       <groupId>com.google.errorprone</groupId>
       <artifactId>error_prone_annotations</artifactId>

guava/pom.xml

@@ -20,6 +20,10 @@
       <groupId>com.google.code.findbugs</groupId>
       <artifactId>jsr305</artifactId>
     </dependency>
+    <dependency>
+      <groupId>org.checkerframework</groupId>
+      <artifactId>checker-qual</artifactId>
+    </dependency>
     <dependency>
       <groupId>com.google.errorprone</groupId>
       <artifactId>error_prone_annotations</artifactId>
@@ -130,6 +134,7 @@
           </offlineLinks>
           <links>
             <link>http://errorprone.info/api/latest/</link>
+            <link>https://checkerframework.org/api/</link>
           </links>
           <!-- TODO(cpovirk): can we use includeDependencySources and a local com.oracle.java:jdk-lib:noversion:sources instead of all this unzipping and manual sourcepath modification? -->
           <!-- (We need JDK *sources*, not just -link, so that {@inheritDoc} works.) -->

pom.xml

@@ -219,6 +219,11 @@
         <artifactId>jsr305</artifactId>
         <version>1.3.9</version>
       </dependency>
+      <dependency>
+        <groupId>org.checkerframework</groupId>
+        <artifactId>checker-qual</artifactId>
+        <version>2.0.0</version>
+      </dependency>
       <dependency>
         <groupId>com.google.errorprone</groupId>
         <artifactId>error_prone_annotations</artifactId>