supersize: Add "printed" to console, Show ~0 for PSS >0 <.1

tools/binary_size/libsupersize/testdata/Console.golden

 ********************************************************************************
 Entering interactive Python shell. Quick reference:
 
 SizeInfo: Clustered, metadata, raw_symbols, section_sizes, symbols
 Symbol: FlagsString, IsBss, IsGeneratedByToolchain, IsGroup, address, aliases, end_address, flags, full_name, generated_source, is_anonymous, name, num_aliases, object_path, padding, pss, pss_without_padding, section, section_name, size, size_without_padding, source_path, template_name
 
 SymbolGroup (extends Symbol): Clustered, CountUniqueSymbols, Filter, GroupedBy, GroupedByName, GroupedByPath, GroupedBySectionName, Inverted, IterLeafSymbols, IterUniqueSymbols, Sorted, SortedByAddress, SortedByCount, SortedByName, WhereAddressInRange, WhereFullNameMatches, WhereGeneratedByToolchain, WhereHasAnyAttribution, WhereHasPath, WhereInSection, WhereIsTemplate, WhereMatches, WhereNameMatches, WhereObjectPathMatches, WherePathMatches, WherePssBiggerThan, WhereSizeBiggerThan, WhereSourceIsGenerated, WhereSourcePathMatches, WhereTemplateNameMatches, is_sorted
 
 SymbolDiff (extends SymbolGroup): IsAdded, IsRemoved, IsSimilar, WhereNotUnchanged, added_count, changed_count, removed_count, unchanged_count
 
 canned_queries: CategorizeByChromeComponent, CategorizeGenerated, TemplatesByName
 
 Functions: Diff(), Disassemble(), ExpandRegex(), Print(), ShowExamples()
-Variables: canned_queries, size_info
+Variables: canned_queries, printed, size_info
 ********************************************************************************
 # Show pydoc for main types:
 import models
 help(models)
 
 # Show all attributes of all symbols & per-section totals:
 Print(size_info, verbose=True)
 
 # Show two levels of .text, grouped by first two subdirectories
 text_syms = size_info.symbols.WhereInSection("t")
 by_path = text_syms.GroupedByPath(depth=2)
 Print(by_path.WherePssBiggerThan(1024))
 
-# Show all non-vtable generated symbols
-generated_syms = size_info.symbols.WhereGeneratedByToolchain()
-Print(generated_syms.WhereNameMatches(r"vtable").Inverted().Sorted())
+# Show all generated symbols, then show only non-vtable ones
+Print(size_info.symbols.WhereGeneratedByToolchain())
+Print(printed[-1].WhereNameMatches(r"vtable").Inverted().Sorted())
 
 # Show all symbols that have "print" in their name or path, except
 # those within components/.
 # Note: Could have also used Inverted(), as above.
 # Note: Use "help(ExpandRegex)" for more about what {{_print_}} does.
 print_syms = size_info.symbols.WhereMatches(r"{{_print_}}")
 Print(print_syms - print_syms.WherePathMatches(r"^components/"))
 
 # Diff two .size files and save result to a file:
 Print(Diff(size_info1, size_info2), to_file="output.txt")
@@ skipping 18 matching lines @@
 Section Sizes (Total=41.8mb (43785380 bytes)):
     .bss: 1.24mb (1300456 bytes) (not included in totals)
     .data: 99.4kb (101768 bytes) (0.2%)
     .data.rel.ro: 1.02mb (1065224 bytes) (2.4%)
     .data.rel.ro.local: 771kb (790024 bytes) (1.8%)
     .rodata: 5.65mb (5927652 bytes) (13.5%)
     .text: 34.2mb (35900712 bytes) (82.0%)
 
 Showing 49 symbols (46 unique) with total pss: 43785380 bytes
 .text=34.2mb     .rodata=5.65mb     .data*=1.87mb     .bss=512kb      total=41.8mb
-Number of object files: 10
+Number of unique paths: 9
 
 Index, Running Total, Section@Address, PSS
 ------------------------------------------------------------
 0)         16 (0.0%)  t@0x28d900   16      base/page_allocator.cc
              _GLOBAL__sub_I_page_allocator.cc
 1)         72 (0.0%)  t@0x28d910   56      base/page_allocator.cc
              _GLOBAL__sub_I_bbr_sender.cc
 2)        100 (0.0%)  t@0x28d948   28      base/page_allocator.cc
              _GLOBAL__sub_I_pacing_sender.cc
 3)        138 (0.0%)  t@0x28d964   38      base/page_allocator.cc
@@ skipping 24 matching lines @@
              ** symbol gap 1
 16)     79710 (0.2%)  t@0x2a1000   94      third_party/container.c
              blink::PaintChunker::releasePaintChunks [clone .part.1]
 17)  35900712 (82.0%) t@0x24ca628  35821002 {no path}
              ** symbol gap 2 (end of section)
 18)  37862696 (86.5%) r@0x266e600  1961984 {no path}
              ** merge strings
 19)  37866121 (86.5%) r@0x284d600  3425    {no path}
              ** merge constants
 20)  37866124 (86.5%) r@0x284e364  3       {no path}
-             ** symbol gap 2
+             ** symbol gap 0
 21)  37866132 (86.5%) r@0x284e364  8       base/page_allocator.cc
 22)  37866176 (86.5%) r@0x284e370  44      base/page_allocator.cc
              Name
 23)  37866208 (86.5%) r@0x284e398  32      third_party/container.c
              chrome::mojom::FilePatcher::Name_
 24)  38542193 (88.0%) r@0x284e518  675985  {no path}
              ** merge strings
 25)  38542248 (88.0%) r@0x28f3450  55      third_party/paint.cc
              kAnimationFrameTimeHistogramClassPath
 26)  38542252 (88.0%) r@0x28f3480  4       third_party/paint.cc
              blink::CSSValueKeywordsHash::findValueImpl::value_word_list
 27)  41828364 (95.5%) r@0x2c158e4  3286112 {no path}
-             ** symbol gap 3 (end of section)
+             ** symbol gap 1 (end of section)
 28)  41828420 (95.5%) d@0x2c176f0  56      third_party/icu/ucnv_ext.c
              ChromeMainDelegate [vtable]
 29)  41828444 (95.5%) d@0x2c17728  24      third_party/icu/ucnv_ext.c
              chrome::mojom::FieldTrialRecorder [vtable]
 30)  42618348 (97.3%) d@0x2c17740  789904  third_party/container.c
              chrome::mojom::FieldTrialRecorderProxy [vtable]
 31)  42618380 (97.3%) d@0x2cd84e0  32      third_party/gvr-android-sdk/libgvr_shim_static_arm.a/libcontroller_api_impl.a_controller_api_impl.o
              .Lswitch.table.45
 32)  42618388 (97.3%) d@0x2cd84f0  8       third_party/gvr-android-sdk/libgvr_shim_static_arm.a/libport_android_jni.a_jni_utils.o
              kSystemClassPrefixes
 33)  42618444 (97.3%) d@0x2cd8500  56      third_party/paint.cc
              ChromeMainDelegateAndroid [vtable]
 34)  42618468 (97.3%) d@0x2cd8538  24      base/page_allocator.cc
              mojo::MessageReceiver [vtable]
 35)  42618480 (97.3%) d@0x2cd8550  12      base/page_allocator.cc
              kMethodsAnimationFrameTimeHistogram
 36)  43683612 (99.8%) d@0x2ddc608  1065132 {no path}
-             ** symbol gap 3 (end of section)
+             ** symbol gap 0 (end of section)
 37)  43683616 (99.8%) d@0x2de7000  4       base/page_allocator.cc
              google::protobuf::internal::pLinuxKernelCmpxchg
 38)  43683620 (99.8%) d@0x2de7004  4       third_party/container.c
              google::protobuf::internal::pLinuxKernelMemoryBarrier
 39)  43683772 (99.8%) d@0x2de7008  152     third_party/container.c
              base::android::kBaseRegisteredMethods
 40)  43683776 (99.8%) d@0x2de70a0  4       third_party/container.c
              base::android::g_renderer_histogram_code
 41)  43683780 (99.8%) d@0x2de70a4  4       third_party/container.c
              base::android::g_library_version_number
 42)  43785380 (100.0%) d@0x2dffd88  101600  {no path}
-             ** symbol gap 3 (end of section)
+             ** symbol gap 0 (end of section)
 43)  43785380 (100.0%) b@0x0        262144  third_party/fft_float.cc
              ff_cos_131072
 44)  43785380 (100.0%) b@0x0        131072  third_party/fft_fixed.cc
              ff_cos_131072_fixed
 45)  43785380 (100.0%) b@0x0        131072  third_party/fft_float.cc
              ff_cos_65536
 46)  43785380 (100.0%) b@0x2dffda0  28      third_party/icu/ucnv_ext.c
              g_chrome_content_browser_client
 47)  43785380 (100.0%) b@0x2dffe80  200     third_party/icu/ucnv_ext.c
              SaveHistogram::atomic_histogram_pointer
 48)  43785380 (100.0%) b@0x2dffe84  4       third_party/icu/ucnv_ext.c
              g_AnimationFrameTimeHistogram_clazz