Release builds are relatively quiet now, this is the only log left:

ninja: Entering directory `out/Release'                             
[1/1] Regenerating ninja files                                                                             
[2767/35942] CC obj/third_party/zlib/zlib_arm_crc32/crc32_simd.o                             
'+soft-float-abi' is not a recognized feature for this target (ignoring feature)            
'+soft-float-abi' is not a recognized feature for this target (ignoring feature)       
[35934/35942] ACTION //clank/java:monochrome_apk__proguard(//build/toolchain/android:android_clang_arm)
Configuration file '../../base/android/proguard/chromium_apk.flags': (line: 33)
Configuration:                                                                                             
        -keep class * implements org.chromium.base.test.params.ParameterProvider             
                                                                                            
        # Allows Proguard freedom in removing these log related calls. We ask for debug
        # and verbose logs to be stripped out in base.Log, so we are just ensuring we
        # get rid of all other debug/verbose logs.
Configuration file '../../clank/third_party/android/javalibs/google-play-services-first-party/base_1p/proguard.txt': (line: 2)
Configuration:
        -keepclassmembers class com.google.android.gms.common.api.internal.BasePendingResult {             
>         com.google.android.gms.common.api.internal.BasePendingResult$ReleasableResultGuardian mResultGuardian;
        }                                                                                   
Configuration file '../../clank/third_party/android/javalibs/google-play-services-first-party/basement_1p/proguard.txt': (line: 5)
Configuration:                                                                               
        -keepclassmembers public class com.google.android.gms.common.internal.safeparcel.SafeParcelable {
            public static final *** NULL;                                                                      
        }                                                                                        
                                                                                                           
        # Needed for Parcelable/SafeParcelable classes & their creators to not get renamed, as they are
        # found via reflection.                                                                                
Configuration file '../../third_party/gvr-android-sdk/src/proguard-gvr.txt': (line: 16)          
Configuration:                                                                                  
        -keep class com.google.vr.cardboard.UsedByNative                                        
      Maybe you meant the fully qualified name 'com.google.android.libraries.hats20.proguard.UsedByNative'?    
      Maybe you meant the fully qualified name 'com.google.ar.core.annotations.UsedByNative'?    
      Maybe you meant the fully qualified name 'com.google.vr.dynamite.client.UsedByNative'?    
Configuration file '../../third_party/gvr-android-sdk/src/proguard-gvr.txt': (line: 17)         
Configuration:                                                                                                 
        -keep @com.google.vr.cardboard.UsedByNative class *                                      
      Maybe you meant the fully qualified name 'com.google.android.libraries.hats20.proguard.UsedByNative'?
      Maybe you meant the fully qualified name 'com.google.ar.core.annotations.UsedByNative'?   
      Maybe you meant the fully qualified name 'com.google.vr.dynamite.client.UsedByNative'?
Configuration file '../../third_party/gvr-android-sdk/src/proguard-gvr.txt': (line: 18)
Configuration:
        -keepclassmembers class * {
>           @com.google.vr.cardboard.UsedByNative *;
        }
      Maybe you meant the fully qualified name 'com.google.android.libraries.hats20.proguard.UsedByNative'?
      Maybe you meant the fully qualified name 'com.google.ar.core.annotations.UsedByNative'?
      Maybe you meant the fully qualified name 'com.google.vr.dynamite.client.UsedByNative'?
Configuration file '../../third_party/gvr-android-sdk/src/proguard-gvr.txt': (line: 18)
Configuration:
        -keepclassmembers class * {
>           @com.google.vr.cardboard.UsedByNative *;
        }
      Maybe you meant the fully qualified name 'com.google.android.libraries.hats20.proguard.UsedByNative'?
      Maybe you meant the fully qualified name 'com.google.ar.core.annotations.UsedByNative'?
      Maybe you meant the fully qualified name 'com.google.vr.dynamite.client.UsedByNative'?
Configuration file '../../third_party/gvr-android-sdk/src/proguard-gvr.txt': (line: 22)
Configuration:
        -keep class com.google.vr.cardboard.annotations.UsedByNative
      Maybe you meant the fully qualified name 'com.google.android.libraries.hats20.proguard.UsedByNative'?
      Maybe you meant the fully qualified name 'com.google.ar.core.annotations.UsedByNative'?
      Maybe you meant the fully qualified name 'com.google.vr.dynamite.client.UsedByNative'?
Configuration file '../../third_party/gvr-android-sdk/src/proguard-gvr.txt': (line: 23)
Configuration:
        -keep @com.google.vr.cardboard.annotations.UsedByNative class *
      Maybe you meant the fully qualified name 'com.google.android.libraries.hats20.proguard.UsedByNative'?
      Maybe you meant the fully qualified name 'com.google.ar.core.annotations.UsedByNative'?
      Maybe you meant the fully qualified name 'com.google.vr.dynamite.client.UsedByNative'?
Configuration file '../../third_party/gvr-android-sdk/src/proguard-gvr.txt': (line: 24)
Configuration:
        -keepclassmembers class * {
>           @com.google.vr.cardboard.annotations.UsedByNative *;
        }
      Maybe you meant the fully qualified name 'com.google.android.libraries.hats20.proguard.UsedByNative'?
      Maybe you meant the fully qualified name 'com.google.ar.core.annotations.UsedByNative'?
      Maybe you meant the fully qualified name 'com.google.vr.dynamite.client.UsedByNative'?
      Maybe you meant the fully qualified name 'com.google.android.libraries.hats20.proguard.UsedByNative'?
      Maybe you meant the fully qualified name 'com.google.ar.core.annotations.UsedByNative'?
      Maybe you meant the fully qualified name 'com.google.vr.dynamite.client.UsedByNative'?
      Maybe you meant the fully qualified name 'com.google.android.libraries.hats20.proguard.UsedByReflection'?
      Maybe you meant the fully qualified name 'com.google.ar.core.annotations.UsedByReflection'?
      Maybe you meant the fully qualified name 'com.google.vr.dynamite.client.UsedByReflection'?
      Maybe you meant the fully qualified name 'org.chromium.base.annotations.UsedByReflection'?
      Maybe you meant the fully qualified name 'com.google.android.libraries.hats20.proguard.UsedByReflection'?
      Maybe you meant the fully qualified name 'com.google.ar.core.annotations.UsedByReflection'?
      Maybe you meant the fully qualified name 'com.google.vr.dynamite.client.UsedByReflection'?
      Maybe you meant the fully qualified name 'org.chromium.base.annotations.UsedByReflection'?
      Maybe you meant the fully qualified name 'com.google.android.libraries.hats20.proguard.UsedByReflection'?
      Maybe you meant the fully qualified name 'com.google.ar.core.annotations.UsedByReflection'?
      Maybe you meant the fully qualified name 'com.google.vr.dynamite.client.UsedByReflection'?
      Maybe you meant the fully qualified name 'org.chromium.base.annotations.UsedByReflection'?
      Maybe you meant the fully qualified name 'com.google.android.libraries.hats20.proguard.UsedByReflection'?
      Maybe you meant the fully qualified name 'com.google.ar.core.annotations.UsedByReflection'?
      Maybe you meant the fully qualified name 'com.google.vr.dynamite.client.UsedByReflection'?
      Maybe you meant the fully qualified name 'org.chromium.base.annotations.UsedByReflection'?
[35942/35942] STAMP obj/clank/java/monochrome_apk.stamp

I would like to also filter out this output eventually so that release builds, like debug builds, have no extraneous output.