Introduce AudioOutputResampler for browser side resampling.

content/renderer/pepper/pepper_platform_audio_output_impl.cc

Index: content/renderer/pepper/pepper_platform_audio_output_impl.cc
diff --git a/content/renderer/pepper/pepper_platform_audio_output_impl.cc b/content/renderer/pepper/pepper_platform_audio_output_impl.cc
index 03f271e22b151adf1122d91bb9eacc0f75ea5a3d..42265ea53f1cde59bcfc3591af9f7ad3b429e385 100644
--- a/content/renderer/pepper/pepper_platform_audio_output_impl.cc
+++ b/content/renderer/pepper/pepper_platform_audio_output_impl.cc
@@ -5,6 +5,7 @@
 #include "content/renderer/pepper/pepper_platform_audio_output_impl.h"
 
 #include "base/bind.h"
+#include "base/command_line.h"
 #include "base/logging.h"
 #include "base/message_loop_proxy.h"
 #include "build/build_config.h"
@@ -13,6 +14,7 @@
 #include "content/renderer/media/audio_hardware.h"
 #include "content/renderer/media/audio_message_filter.h"
 #include "content/renderer/render_thread_impl.h"
+#include "media/base/media_switches.h"
 
 namespace content {
 
@@ -121,11 +123,17 @@ bool PepperPlatformAudioOutputImpl::Initialize(
 
   media::AudioParameters::Format format;
   const int kMaxFramesForLowLatency = 2047;
-  // Use the low latency back end if the client request is compatible, and
-  // the sample count is low enough to justify using AUDIO_PCM_LOW_LATENCY.
-  if (sample_rate == audio_hardware::GetOutputSampleRate() &&
-      frames_per_buffer <= kMaxFramesForLowLatency &&
-      frames_per_buffer % audio_hardware::GetOutputBufferSize() == 0) {
+
+  const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
+  if (cmd_line->HasSwitch(switches::kEnableAudioOutputResampler)) {
+    // Rely on AudioOutputResampler to handle any inconsistencies between the
+    // hardware params required for low latency and the requested params.
+    format = media::AudioParameters::AUDIO_PCM_LOW_LATENCY;
+  } else if (sample_rate == audio_hardware::GetOutputSampleRate() &&
+             frames_per_buffer <= kMaxFramesForLowLatency &&
+             frames_per_buffer % audio_hardware::GetOutputBufferSize() == 0) {
+    // Use the low latency back end if the client request is compatible, and
+    // the sample count is low enough to justify using AUDIO_PCM_LOW_LATENCY.
     format = media::AudioParameters::AUDIO_PCM_LOW_LATENCY;
   } else {
     format = media::AudioParameters::AUDIO_PCM_LINEAR;