Re-apply "Log Tonic errors with FML_LOG" (flutter#6026)

This reverts commit d038970 and updates the tonic SHA.

DEPS

@@ -123,7 +123,7 @@ deps = {
    # and not have to specific specific hashes.
 
   'src/third_party/tonic':
-   Var('fuchsia_git') + '/tonic' + '@' + '57d508b12462db686573edcbc97891d90cf92f90',
+   Var('fuchsia_git') + '/tonic' + '@' + '6bab0f304b043d8cf09900334e78b63111f76c5c',
 
   'src/third_party/benchmark':
    Var('fuchsia_git') + '/third_party/benchmark' + '@' + '296537bc48d380adf21567c5d736ab79f5363d22',

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: ec72b49802f64feb7fa74573a404abc5
+Signature: 092d7fdd5c3c7962192e716fb3746099
 
 UNUSED LICENSES:
 
@@ -16752,8 +16752,10 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 ====================================================================================================
 LIBRARY: tonic
-ORIGIN: ../../../third_party/tonic/common/macros.h + ../../../third_party/tonic/LICENSE
+ORIGIN: ../../../third_party/tonic/common/log.cc + ../../../third_party/tonic/LICENSE
 TYPE: LicenseType.bsd
+FILE: ../../../third_party/tonic/common/log.cc
+FILE: ../../../third_party/tonic/common/log.h
 FILE: ../../../third_party/tonic/common/macros.h
 ----------------------------------------------------------------------------------------------------
 Copyright 2018 The Fuchsia Authors. All rights reserved.

shell/common/shell.cc

@@ -28,6 +28,7 @@
 #include "flutter/shell/common/vsync_waiter.h"
 #include "third_party/dart/runtime/include/dart_tools_api.h"
 #include "third_party/skia/include/core/SkGraphics.h"
+#include "third_party/tonic/common/log.h"
 
 #ifdef ERROR
 #undef ERROR
@@ -176,6 +177,9 @@ static void PerformInitializationTasks(const blink::Settings& settings) {
       fml::SetLogSettings(log_settings);
     }
 
+    tonic::SetLogHandler(
+        [](const char* message) { FML_LOG(ERROR) << message; });
+
     if (settings.trace_skia) {
       InitSkiaEventTracer(settings.trace_skia);
     }