Don't sample reports with --enable-crash-reporter-for-testing

Bug: 923475
Change-Id: I83a67e5053bf50ce6299523eb0cadff68b8169d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1506656Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Joshua Peraza <jperaza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638320}

android_webview/common/crash_reporter/aw_crash_reporter_client.cc

@@ -18,6 +18,7 @@
 #include "base/logging.h"
 #include "base/path_service.h"
 #include "base/scoped_native_library.h"
+#include "base/base_switches.h"
 #include "build/build_config.h"
 #include "components/crash/content/app/crash_reporter_client.h"
 #include "components/crash/content/app/crashpad.h"
@@ -69,7 +70,14 @@ class AwCrashReporterClient : public crash_reporter::CrashReporterClient {
     *sanitize_stacks = true;
   }
 
-  unsigned int GetCrashDumpPercentage() override { return 100; }
+  unsigned int GetCrashDumpPercentage() override {
+    if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+            switches::kEnableCrashReporterForTesting)) {
+      return 100;
+    }
+
+    return 100;
+  }
 
   bool GetBrowserProcessType(std::string* ptype) override {
     *ptype = base::CommandLine::ForCurrentProcess()->HasSwitch(