[Android] Incorporate findbugs into android builds.

build/android/findbugs_filter/findbugs_exclude.xml

Index: build/android/findbugs_filter/findbugs_exclude.xml
diff --git a/build/android/findbugs_filter/findbugs_exclude.xml b/build/android/findbugs_filter/findbugs_exclude.xml
index 5060e4745d3826628b41f68f223893820f2642fe..6e8d8ba5e4988a68fb31010d627778fd8c1852c0 100644
--- a/build/android/findbugs_filter/findbugs_exclude.xml
+++ b/build/android/findbugs_filter/findbugs_exclude.xml
@@ -17,7 +17,6 @@ In particular, ~ at the start of a string means it's a regex.
   <Match>
     <Class name="~org\.chromium\..*\.Manifest(\$\w+)?" />
   </Match>
-  <!-- Ignore "reliance on default String encoding" warnings, as we're not multi-platform -->
   <Match>
     <Class name="~org\.chromium\.chrome\.browser\.ChromiumApplication.*" />
     <Method name="onCancel" />
@@ -28,6 +27,8 @@ In particular, ~ at the start of a string means it's a regex.
     <Method name="onClick" />
     <Bug code="Dm" />
   </Match>
+  <Bug pattern="DM_STRING_CTOR" />
+  <!-- Ignore "reliance on default String encoding" warnings, as we're not multi-platform -->
   <Bug pattern="DM_DEFAULT_ENCODING" />
   <!-- Ignore bugs that are often false-positives in test code -->
   <Match>