Import SQLite 3.8.7.4.

third_party/sqlite/patches/0004-Use-seperate-page-cache-pools-for-each-sqlite-connec.patch

-From 22030cd2e05e746a169066c37b28c580b0a57284 Mon Sep 17 00:00:00 2001
-From: rmcilroy <rmcilroy@chromium.org>
-Date: Thu, 20 Jun 2013 22:50:12 +0000
-Subject: [PATCH 04/23] Use seperate page-cache pools for each sqlite
- connection.
-
-Due to multiple different subsystems using sqlite, the shared global page
-cache policy does not suite our use-cases on Chrome very well.  This CL
-enables a compile time flag to be set to disable shared cache pools.
-
-BUG=243769
-
-Original review URL: https://chromiumcodereview.appspot.com/17413004
----
- third_party/sqlite/src/src/pcache1.c | 8 ++++++--
- 1 file changed, 6 insertions(+), 2 deletions(-)
-
-diff --git a/third_party/sqlite/src/src/pcache1.c b/third_party/sqlite/src/src/pcache1.c
-index ad44395..e4d0705 100644
---- a/third_party/sqlite/src/src/pcache1.c
-+++ b/third_party/sqlite/src/src/pcache1.c
-@@ -549,10 +549,12 @@ static sqlite3_pcache *pcache1Create(int szPage, int bPurgeable){
-   int sz;               /* Bytes of memory required to allocate the new cache */
- 
-   /*
--  ** The seperateCache variable is true if each PCache has its own private
-+  ** The separateCache variable is true if each PCache has its own private
-   ** PGroup.  In other words, separateCache is true for mode (1) where no
-   ** mutexing is required.
-   **
-+  **   *  Always use separate caches (mode-1) if SQLITE_SEPARATE_CACHE_POOLS
-+  **
-   **   *  Always use a unified cache (mode-2) if ENABLE_MEMORY_MANAGEMENT
-   **
-   **   *  Always use a unified cache in single-threaded applications
-@@ -560,7 +562,9 @@ static sqlite3_pcache *pcache1Create(int szPage, int bPurgeable){
-   **   *  Otherwise (if multi-threaded and ENABLE_MEMORY_MANAGEMENT is off)
-   **      use separate caches (mode-1)
-   */
--#if defined(SQLITE_ENABLE_MEMORY_MANAGEMENT) || SQLITE_THREADSAFE==0
-+#ifdef SQLITE_SEPARATE_CACHE_POOLS
-+  const int separateCache = 1;
-+#elif defined(SQLITE_ENABLE_MEMORY_MANAGEMENT) || SQLITE_THREADSAFE==0
-   const int separateCache = 0;
- #else
-   int separateCache = sqlite3GlobalConfig.bCoreMutex>0;
--- 
-2.2.1
-