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    [tracing] Add sqlite memory statistics to tracing. · 9f8022f2
    ssid authored
    The process-wide memory usage statistics of sqlite library is added to
    chrome://tracing. The memory usage of sqlite library is mainly through
    sqlite_malloc. The total usage of the process is recorded by
    sqlite3_memory_used() api. This CL also adds per-connection memory
    usage to tracing. Each connection uses memory for cache, schema and
    statement, and these usages are recorded. sqlit3_malloc uses malloc
    internally to allocate memory. So, thie memory is traced as
    sub-allocation from system_allocator(malloc).
    This CL lets us keep track of sqlite memory usage in chrome telemetry.
    
    BUG=466141
    
    Review URL: https://codereview.chromium.org/1327063002
    
    Cr-Commit-Position: refs/heads/master@{#353549}
    9f8022f2