Roll src/third_party/trace-viewer e2b5374:473c6c4

This patch pulls in recent Trace Viewer changes, almost half of which
are UI fixes and changes for memory-infra.

Summary of changes available at (79 patches):
https://chromium.googlesource.com/external/trace-viewer/+log/e2b5374..473c6c4

Size increase for resources.pak:
51889 bytes (17350965 -> 17402854)

BUG=458295

Review URL: https://codereview.chromium.org/1146143002

Cr-Commit-Position: refs/heads/master@{#330756}

DEPS

@@ -132,7 +132,7 @@ deps = {
    Var('chromium_git') + '/crashpad/crashpad.git' + '@' + '00c42ae7bdcf40d15c02b87e088c1eb565a51333',
 
   'src/third_party/trace-viewer':
-   Var('chromium_git') + '/external/trace-viewer.git' + '@' + 'e2b5374c4941c450b168d4c7d9110fb91b2d4c19',
+   Var('chromium_git') + '/external/trace-viewer.git' + '@' + '473c6c4e8722676153d3449c67094aa55d6f6799',
 
   'src/third_party/WebKit':
    Var('chromium_git') + '/chromium/blink.git' + '@' +  Var('webkit_revision'),