Disable all the tests that are flaking more than 5% on Linux builders.

chrome/test/ppapi/ppapi_browsertest.cc

Index: chrome/test/ppapi/ppapi_browsertest.cc
diff --git a/chrome/test/ppapi/ppapi_browsertest.cc b/chrome/test/ppapi/ppapi_browsertest.cc
index bece9c7a068758ed514ddfecf8b153b05efc0a42..b590bfc98f5f63fc8a97ed973bac8a6125f0daa2 100644
--- a/chrome/test/ppapi/ppapi_browsertest.cc
+++ b/chrome/test/ppapi/ppapi_browsertest.cc
@@ -1067,8 +1067,14 @@ IN_PROC_BROWSER_TEST_F(PPAPINaClPNaClNonSfiTest,
       LIST_TEST(Audio_AudioCallback4) \
   )
 
+#if defined(OS_LINUX)
+// http://crbug.com/396464
+#define MAYBE_Audio DISABLED_Audio
+#else
+#define MAYBE_Audio Audio
+#endif
 // PPB_Audio is not supported in-process.
-IN_PROC_BROWSER_TEST_F(OutOfProcessPPAPITest, Audio) {
+IN_PROC_BROWSER_TEST_F(OutOfProcessPPAPITest, MAYBE_Audio) {
   RUN_AUDIO_SUBTESTS;
 }
 IN_PROC_BROWSER_TEST_F(PPAPINaClNewlibTest, Audio) {
@@ -1247,8 +1253,9 @@ IN_PROC_BROWSER_TEST_F(OutOfProcessPPAPITest, MAYBE_FlashMessageLoop) {
 #define MAYBE_Compositor0 DISABLED_Compositor0
 #define MAYBE_Compositor1 DISABLED_Compositor1
 #else
-#define MAYBE_Compositor0 Compositor0
-#define MAYBE_Compositor1 Compositor1
+// flaky on Linux: http://crbug.com/396482
+#define MAYBE_Compositor0 DISABLED_Compositor0
+#define MAYBE_Compositor1 DISABLED_Compositor1
 #endif
 
 TEST_PPAPI_NACL_SUBTESTS(MAYBE_Compositor0, RUN_COMPOSITOR_SUBTESTS_0)